August 15, 20241 yr Hi guys, I've been an Unraid user for about 14 years now, but I'm finally stumped. There's something wrong with my server - whenever I ssh in or use the web console, the session freezes after about 3-4 minutes, and I can't type anything else. The only way back in seems to be to reconnect. Then I get another few minutes and it freezes again. Has anyone seen this behaviour before? I'm on Unraid OS Pro 6.12.8. Other than this it works fine. Happy to attach any relevant logs or settings if requested.
August 20, 20241 yr Author It also freezes halfway through doing anything with Docker (adding new containers or updating them) - it's 50/50 whether anything I do with that will work each time.
August 20, 20241 yr Community Expert Try updating to latest stable, and if issues continue, post the diags after they happen, to see if there's something logged.
August 20, 20241 yr Author Ahh oops, didn't realize I wasn't on the latest version. Upgrading now, thanks!
August 28, 20241 yr Author I found the problem, updating here in case anyone else has the same issue in the future. My network is set up as follows: VLAN 6: MGMT VLAN 10: Data Other VLANs: not relevant here. My PC is on the "Data" VLAN. Unraid has interfaces on several VLANs, including MGMT and Data, but the intention is to manage it through VLAN 6 so I can control access to it at the network level. All my management traffic (switch interfaces, Unraid, firewall, WAPs, SNMP etc.) is on the MGMT VLAN, so this makes sense to me. When I used SSH from my laptop on VLAN 10 to access Unraid on VLAN 6, it would go through my firewall as expected, but the reply traffic was weird, because Unraid would send the replies out directly on VLAN 10, instead of on the interface they were received on to be routed back through the firewall. This caused all sorts of havoc with TCP. I'm surprised it worked at all tbh. To resolve it, I've now set up a reverse proxy on my firewall using HAProxy, which I use to access the web interface, and a SSH proxy/jumpbox (also on the firewall) that I use for SSH access. The problem has now gone away. I used this tutorial to set up the SSH jump box: https://medium.com/@nathan.c.cole/pfsense-ssh-proxy-edd03f9dbe60 Hope that helps someone.
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