<![CDATA[Some port filtered from client]]>Hi,

I access via openvpn to my virtual server (proxmox) and I have a very special problem:

-Connected through the VPN I can access two Windows guest with RDP, if I nmap the machine the open port appears open. (work as expected)
-Connected through the VPN I cannot access the Linux guests with SSH, if I nmap the machine the open port appears filtered (even the port 80) but the guests answer to my ping requests.
-Connected through a ssh tunnel I can access everything, the open ports appears at open and everything works fine.

The guest are on the same network. I have some other install with the same settings and everything work well. We really do not understand.

Help please.

]]>https://forum.netgate.com/topic/94914/some-port-filtered-from-clientRSS for NodeWed, 14 Oct 2026 07:13:44 GMTMon, 01 Feb 2016 13:37:07 GMT60<![CDATA[Reply to Some port filtered from client on Mon, 01 Feb 2016 15:15:17 GMT]]>Replying to myself, I found the solution thanks to this post: https://forum.pfsense.org/index.php?topic=88467.msg504596#msg504596

Go to "System->Advance Networking" and disable:

  • Hardware Checksum Offloading
  • Hardware TCP Segmentation Offloading
  • Hardware Large Receive Offloading

and reboot.

]]>https://forum.netgate.com/post/599831https://forum.netgate.com/post/599831Mon, 01 Feb 2016 15:15:17 GMT