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Issue with WSL listening to TCP ports #1554

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Issue with WSL listening to TCP ports#1554
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@lefty-kreouzis

Description

@lefty-kreouzis
lefty-kreouzis
opened on Dec 29, 2016
  • A brief description

I ma unable to start a tcp listening port in Bash for windows

  • Expected results
    I should be able to listen to a tcp port when running a Bash for windows command

  • Actual results (with terminal output if applicable)
    I cannot connect to the listening port

  • Your Windows build number
    OS Build 14986.1001

  • Steps / All commands required to reproduce the error from a brand new installation
    Install netcat command
    Open one bash window
    Run:
    lefty@Turing:~$ nc -4 -l 4434
    This starts a listening server on tcp port 4434 and waits for connections
    any text sent to tcp port 4434 should be printed out

Open one more bash window
Run:
lefty@Turing:~$ echo 'It works' | nc -4 -v localhost 4434
nc: connect to localhost port 4434 (tcp) failed: Connection refused
nc: connect to localhost port 4434 (tcp) failed: Connection refused

expected result:

(on an actual Ubuntu box)

On one window:
lefty@ubuntu-1gb-lon1-01:~$ nc -4 -l 4434
It works

On the other:

lefty@ubuntu-1gb-lon1-01:~$ echo 'It works' | nc -4 -v localhost 4434
Connection to localhost 4434 port [tcp/*] succeeded!

  • Strace of the failing command

SERVER Strace:
lefty@Turing:~$ strace nc -4 -l 4434
execve("/bin/nc", ["nc", "-4", "-l", "4434"], [/* 15 vars */]) = 0
brk(NULL) = 0x859000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f03e6930000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36889, ...}) = 0
mmap(NULL, 36889, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f03e6926000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libbsd.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0004\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=81040, ...}) = 0
mmap(NULL, 2179952, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f03e63e0000
mprotect(0x7f03e63f3000, 2093056, PROT_NONE) = 0
mmap(0x7f03e65f2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12000) = 0x7f03e65f2000
mmap(0x7f03e65f4000, 880, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f03e65f4000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P9\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=101200, ...}) = 0
mmap(NULL, 2206280, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f03e61c0000
mprotect(0x7f03e61d7000, 2097152, PROT_NONE) = 0
mmap(0x7f03e63d7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f03e63d7000
mmap(0x7f03e63d9000, 6728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f03e63d9000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f03e6920000
mmap(NULL, 3967392, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f03e5df0000
mprotect(0x7f03e5faf000, 2097152, PROT_NONE) = 0
mmap(0x7f03e61af000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7f03e61af000
mmap(0x7f03e61b5000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f03e61b5000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f03e6910000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f03e6900000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f03e68f0000
arch_prctl(ARCH_SET_FS, 0x7f03e6900700) = 0
mprotect(0x7f03e61af000, 16384, PROT_READ) = 0
mprotect(0x7f03e63d7000, 4096, PROT_READ) = 0
mprotect(0x7f03e65f2000, 4096, PROT_READ) = 0
mprotect(0x606000, 4096, PROT_READ) = 0
mprotect(0x7f03e6825000, 4096, PROT_READ) = 0
munmap(0x7f03e6926000, 36889) = 0
brk(NULL) = 0x859000
brk(0x87a000) = 0x87a000
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
bind(3, {sa_family=AF_INET, sin_port=htons(4434), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
listen(3, 1) = 0
accept(3,

Client STRACE:

lefty@Turing:~$ echo 'It works' | strace nc -4 -v localhost 4434
execve("/bin/nc", ["nc", "-4", "-v", "localhost", "4434"], [/* 15 vars /]) = 0
brk(NULL) = 0xa5b000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc22bab0000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36889, ...}) = 0
mmap(NULL, 36889, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc22baa6000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libbsd.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0004\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=81040, ...}) = 0
mmap(NULL, 2179952, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc22b5e0000
mprotect(0x7fc22b5f3000, 2093056, PROT_NONE) = 0
mmap(0x7fc22b7f2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12000) = 0x7fc22b7f2000
mmap(0x7fc22b7f4000, 880, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc22b7f4000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P9\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=101200, ...}) = 0
mmap(NULL, 2206280, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc22b3c0000
mprotect(0x7fc22b3d7000, 2097152, PROT_NONE) = 0
mmap(0x7fc22b5d7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7fc22b5d7000
mmap(0x7fc22b5d9000, 6728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc22b5d9000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc22baa0000
mmap(NULL, 3967392, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc22aff0000
mprotect(0x7fc22b1af000, 2097152, PROT_NONE) = 0
mmap(0x7fc22b3af000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7fc22b3af000
mmap(0x7fc22b3b5000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc22b3b5000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc22ba90000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc22ba80000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc22ba70000
arch_prctl(ARCH_SET_FS, 0x7fc22ba80700) = 0
mprotect(0x7fc22b3af000, 16384, PROT_READ) = 0
mprotect(0x7fc22b5d7000, 4096, PROT_READ) = 0
mprotect(0x7fc22b7f2000, 4096, PROT_READ) = 0
mprotect(0x606000, 4096, PROT_READ) = 0
mprotect(0x7fc22ba25000, 4096, PROT_READ) = 0
munmap(0x7fc22baa6000, 36889) = 0
brk(NULL) = 0xa5b000
brk(0xa7c000) = 0xa7c000
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
open("/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=497, ...}) = 0
read(3, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 497
read(3, "", 4096) = 0
close(3) = 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36889, ...}) = 0
mmap(NULL, 36889, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc22baa6000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/tls/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/tls/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/tls/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/tls", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
open("/usr/lib/x86_64-linux-gnu/tls/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/tls/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/tls/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/tls", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
open("/lib/tls/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/tls/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/tls/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/tls", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/lib/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/lib", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
open("/usr/lib/tls/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/tls/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/tls", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64", 0x7fffcc71a120) = -1 ENOENT (No such file or directory)
open("/usr/lib/libnss_db.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/usr/lib", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
munmap(0x7fc22baa6000, 36889) = 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36889, ...}) = 0
mmap(NULL, 36889, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc22baa6000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260!\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=47600, ...}) = 0
mmap(NULL, 2168600, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc22add0000
mprotect(0x7fc22addb000, 2093056, PROT_NONE) = 0
mmap(0x7fc22afda000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7fc22afda000
mmap(0x7fc22afdc000, 22296, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc22afdc000
close(3) = 0
mprotect(0x7fc22afda000, 4096, PROT_READ) = 0
munmap(0x7fc22baa6000, 36889) = 0
open("/etc/services", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=19605, ...}) = 0
read(3, "# Network services, Internet sty"..., 4096) = 4096
read(3, "\t\t# IPX\nipx\t\t213/udp\nimap3\t\t220/"..., 4096) = 4096
read(3, "nessus\t\t1241/tcp\t\t\t# Nessus vuln"..., 4096) = 4096
read(3, "347/tcp\t\t\t# gnutella\ngnutella-rt"..., 4096) = 4096
read(3, "ureg\t779/udp\t\tmoira_ureg\t# Moira"..., 4096) = 3221
read(3, "", 4096) = 0
close(3) = 0
getpid() = 779
open("/etc/resolv.conf", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=141, ...}) = 0
read(3, "# DO NOT EDIT THIS FILE BY H"..., 4096) = 141
read(3, "", 4096) = 0
close(3) = 0
uname({sysname="Linux", nodename="Turing", ...}) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
open("/etc/host.conf", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=92, ...}) = 0
read(3, "# The "order" line is only used "..., 4096) = 92
read(3, "", 4096) = 0
close(3) = 0
open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=4461, ...}) = 0
read(3, "# The following lines are desira"..., 4096) = 4096
read(3, "2\tdxbdoap14sv\teksho\n10.20.155.62"..., 4096) = 365
read(3, "", 4096) = 0
close(3) = 0
open("/etc/gai.conf", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2584, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=2584, ...}) = 0
read(3, "# Configuration for getaddrinfo("..., 4096) = 2584
read(3, "", 4096) = 0
close(3) = 0
socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE) = 3
bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
getsockname(3, {sa_family=AF_NETLINK, pid=779, groups=00000000}, [12]) = 0
time(NULL) = 1482979039
sendto(3, "\24\0\0\0\26\0\1\3\337vdX\0\0\0\0\0\0\0\0", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\20\0\0\10\0\0\0\10\0\1\0\251\376w\272"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\10\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\20\0\0\20\0\0\0\10\0\1\0\251\376\341\254"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\20\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\20\0\0\2\0\0\0\10\0\1\0\251\376"B"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\375\2\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\10\0\0\1\0\0\0\10\0\1\0\177\0\0\1"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n\200\0\0\1\0\0\0\24\0\1\0\0\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\30\0\0\16\0\0\0\10\0\1\0\300\250\1"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\16\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\20\0\0\v\0\0\0\10\0\1\0\251\376\253\7"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\v\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\r\0\0\0\24\0\1\0 \1\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\r\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\337vdX\v\3\0\0\2\30\0\0\t\0\0\0\10\0\1\0\300\250\211\1"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 60
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"@\0\0\0\24\0\2\0\337vdX\v\3\0\0\n@\0\0\t\0\0\0\24\0\1\0\376\200\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\20\0\0\0\3\0\2\0\337vdX\v\3\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 16
close(3) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(4434), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
getsockname(3, {sa_family=AF_INET, sin_port=htons(61465), sin_addr=inet_addr("0.0.0.0")}, [16]) = 0
close(3) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(4434), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)
fcntl(3, F_SETFL, O_RDWR) = 0
write(2, "nc: ", 4nc: ) = 4
write(2, "connect to localhost port 4434 ("..., 43connect to localhost port 4434 (tcp) failed) = 43
write(2, ": ", 2: ) = 2
write(2, "Connection refused\n", 19Connection refused
) = 19
close(3) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(4434), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)
fcntl(3, F_SETFL, O_RDWR) = 0
write(2, "nc: ", 4nc: ) = 4
write(2, "connect to localhost port 4434 ("..., 43connect to localhost port 4434 (tcp) failed) = 43
write(2, ": ", 2: ) = 2
write(2, "Connection refused\n", 19Connection refused
) = 19
close(3) = 0
close(-1) = -1 EBADF (Bad file descriptor)
exit_group(1) = ?
+++ exited with 1 +++

  • Required packages and commands to install
    This is cross cutting I first noticed it on ssh forwarding but the netcat (nc) command is the easiest to verify

Thanks

Lefty

Activity

lefty-kreouzis
mentioned this on Dec 29, 2016
lefty-kreouzis

lefty-kreouzis commented on Dec 29, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 29, 2016
Author

This looks like a duplicate of #1498

lefty-kreouzis
mentioned this on Dec 29, 2016
therealkenc

therealkenc commented on Dec 29, 2016

@therealkenc
therealkenc
on Dec 29, 2016 · edited by therealkenc

Repro steps with netcat work here on 14986 for what it's worth ('it works' on the server and 'succeeded!' on the client). Your straces look pretty vanilla at first glance. That accept(3, on the last line sure thinks it's ready for incoming.

After you've fired up the server, can you see it listening if you run netstat -an | bash -c "grep 4434" from the Windows CMD prompt? [No netstat on WSL yet.]

It's probably a dup of #1498 but node servers work here too. Common networking scenarios used to fail because of the NETLINK_ROUTE stuff, but you're on the latest and those calls look okay in your strace. Anything special about your setup network-wise?

sunilmut

sunilmut commented on Dec 29, 2016

@sunilmut
sunilmut
on Dec 29, 2016
Member

@lefty-kreouzis - I cannot reproduce the issue either on 14986 (see screenshot below). If you are running any AV software (see #475), can you try disabling it and also opening up the required port through Windows firewall.

image

lefty-kreouzis

lefty-kreouzis commented on Dec 30, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 30, 2016
Author

The listening port is not shown in CMD

I have avast antivirus but I disabled it
I also disabled windows firewall but the same issue persists:

image

sunilmut

sunilmut commented on Dec 30, 2016

@sunilmut
sunilmut
on Dec 30, 2016
Member

That's strange. Few things:

  1. Can you confirm you are on 14986?
  2. Just for my sanity, can you also share the output of `netstat -an | find "4444" ?
  3. Can you collect a strace and share it out? strace -o <trace_file> -ff nc -v -4 -l 4444
lefty-kreouzis

lefty-kreouzis commented on Dec 30, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 30, 2016
Author

Hi Sunil

I am definitely on 14986:

C:\Users\lefty>ver

Microsoft Windows [Version 10.0.14986]

C:\Users\lefty>

image

nc.trace.27.txt

Weird

I am performing a backup so I can reinstall windows ..........

Thanks

Lefty

lefty-kreouzis

lefty-kreouzis commented on Dec 30, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 30, 2016
Author

BTW i had removed the WSL and reinstalled it by running
lxrun /uninstall
and
lxrun /install

(I kept my home directory files BTW0

sunilmut
added
network
on Dec 30, 2016
lefty-kreouzis

lefty-kreouzis commented on Dec 30, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 30, 2016
Author

I did a reinstall of windows (keeping my files) and now it works.....

Weird

therealkenc

therealkenc commented on Dec 30, 2016

@therealkenc
therealkenc
on Dec 30, 2016 · edited by therealkenc

Did you reinstall avast though? Notwithstanding other ghosts in the machine, that's still as good a suspect as any, even given the fact you disabled it. I would have suggested uninstalling avast first if I knew you were up for the big hammer of reinstalling Windows.

lefty-kreouzis

lefty-kreouzis commented on Dec 30, 2016

@lefty-kreouzis
lefty-kreouzis
on Dec 30, 2016
Author

Just reinstalled Avast and it still works.....

therealkenc

therealkenc commented on Dec 30, 2016

@therealkenc
therealkenc
on Dec 30, 2016

That is really weird....

sunilmut

sunilmut commented on Dec 30, 2016

@sunilmut
sunilmut
on Dec 30, 2016
Member

There has to be some collision with the AV here. That's all I got here. But, I am glad it's working for you now. I would like to encourage everyone to talk to their AV vendors, in supporting WSL. Our voice only reaches so far.

I am closing this issue out.

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          Issue with WSL listening to TCP ports · Issue #1554 · microsoft/WSL