Connection port timeout

[Frediano Ziglio]

On Wed, May 14, 2025 at 11:23 PM 吴山 <shan.wu at zstack.io> wrote:

>
> After executing the nc command twice, executing the nc command again timed
> out, and the netstat command showed that the server did not close the
> socket connection：
>
> [root at 172-26-51-207 ~]# systemctl status usbredir-4100-003-002.service
> ● usbredir-4100-003-002.service - /sbin/usbredirserver -p 4100 003-002
>   Loaded: loaded (/run/systemd/transient/usbredir-4100-003-002.service;
> transi>
> Transient: yes
>   Active: active (running) since Tue 2025-05-13 14:13:41 CST; 12min ago
> Main PID: 3864277 (usbredirserver)
>     Tasks: 2 (limit: 101063)
>   Memory: 608.0K
>   CGroup: /system.slice/usbredir-4100-003-002.service
>           └─3864277 /sbin/usbredirserver -p 4100 003-002
> 5月 13 14:13:41 172-26-51-207 systemd[1]: Started /sbin/usbredirserver -p
> 4100 >
> 5月 13 14:13:45 172-26-51-207 usbredirserver[3864277]: usbredirparser: Peer
> ver>
>
> [root at 172-26-51-207 ~]# rpm -qa | grep usb
> qemu-kvm-hw-usbredir-6.2.0-232.g09252161d1.el8.x86_64
> usbredir-0.12.0-2.el8.x86_64
> libusbx-1.0.23-4.el8.x86_64
> usbutils-010-3.el8.x86_64
> usbredir-server-0.12.0-2.el8.x86_64
> libgusb-0.3.0-1.el8.x86_64
> [root at 172-26-51-207 ~]# nc -zv 172.26.51.207 4100
> Ncat: Version 7.70 ( https://nmap.org/ncat )
> Ncat: Connected to 172.26.51.207:4100.
> Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
> [root at 172-26-51-207 ~]# netstat -nap | grep 4100
> tcp        0      0 172.26.51.207:47988     172.26.51.207:4100
> FIN_WAIT2   -
> tcp6       1      0 :::4100                 :::*
> LISTEN      3864277/usbredirser
> tcp6       1      0 172.26.51.207:4100      172.26.51.207:47988
> CLOSE_WAIT  -
> tcp6       0      0 172.26.51.207:4100      172.26.51.230:58576
> ESTABLISHED 3864277/usbredirser
> [root at 172-26-51-207 ~]# nc -zv 172.26.51.207 4100
> Ncat: Version 7.70 ( https://nmap.org/ncat )
> Ncat: Connected to 172.26.51.207:4100.
> Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
> [root at 172-26-51-207 ~]# netstat -nap | grep 4100
> tcp        0      0 172.26.51.207:47988     172.26.51.207:4100
> FIN_WAIT2   -
> tcp        0      0 172.26.51.207:33384     172.26.51.207:4100
> FIN_WAIT2   -
> tcp6       2      0 :::4100                 :::*
> LISTEN      3864277/usbredirser
> tcp6       1      0 172.26.51.207:4100      172.26.51.207:33384
> CLOSE_WAIT  -
> tcp6       1      0 172.26.51.207:4100      172.26.51.207:47988
> CLOSE_WAIT  -
> tcp6       0      0 172.26.51.207:4100      172.26.51.230:58576
> ESTABLISHED 3864277/usbredirser
> [root at 172-26-51-207 ~]# nc -zv 172.26.51.207 4100
> Ncat: Version 7.70 ( https://nmap.org/ncat )
> Ncat: Connection timed out.
>
> It looks like you are testing from the same host but you already have a
connection from a remote host.
This should not happen if you don't already have external connections.


> 此信件包含保密信息，请收件人予以保密，未经许可，请勿向第三人披露，谢谢。
>
> This letter contains confidential information which is requested to be kept confidential by the recipient and shall not be disclosed to any third party without permission. Thank you.
>
>
Do you realize that if this is true you are violating corporate policies,
right?

Frediano
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