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Issue with WSL listening to TCP ports #1554

Closed
@lefty-kreouzis

Description

@lefty-kreouzis
  • 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

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