For the past month or so my storage box has been driving me insane. Whenever I SSH into the box, after about 30 seconds it would always disconnect me. I checked everything from routes, to firewall rules, and nothing was amiss. I spent weeks looking for the cause of these SSH Disconnects, but to no avail. That is, until recently. After some extreme googling, I was able to figure out the cause and I had to share it.
On the server in question, I have it hooked up to two networks. One vi cable, and another using a VLAN tag on the same port. If I were to take down the VLAN interface, or the direct cable interface, then SSH would not have any disconnect issues. This lead me to believe it was a routing issue, or a network configuration problem. Well in the end, I found the cause to be none other then my firewall, PfSense!
After finding a thread on their forum with someone who shared my troubles, I was able to find a solution and I felt it should be shared. (That said thread is linked at the bottom of this post).
So, lets get started!
- Login to your PfSense firewall
- Go to System > Advanced > Firewall / NAT
- Set Firewall Optimization Options to Conservative
- Enable Clear invalid DF bits instead of dropping the packets
In the end, it should look like this:
After this, my SSH disconnects completely disappeared! I hope you find this as useful as I did.
Citation:
Pingback: SSH connection through UTM 9 VM dropping after 1 min - Sophos User Bulletin Board
This was VERY helpful. I think my telnet/ssh disconnect problems are gone! Knock on wood, fingers crossed!
Excellent! That worked for us, as well, although our symptoms were slightly different. During backup times, when the network was being stressed, this would occur to long-running persistent SSH connections. This change has allowed those sessions to remain connected.
I tried that solution, and at the first look it worked
But the problem must be elsewhere. If you take a look at the help page of pfSense it shows that in the “normal” Firewall mode “tcp.opening No response yet” get terminated after 30secs which is the time ssh takes to disconnect.
https://doc.pfsense.org/index.php/Advanced_Setup#Firewall.2FNAT
In “conservative” mode this time is just increased to 15min!
So i waited for 15min instead of 30sec -> and the same problem occured.
Do you have any idea what else it could be?
I have the same issue as you above only means the problem takes 15 min to appear did you ever find a solution ?
The problem for me turned out to be the MTU size.
See explanation in: http://www.heitorlessa.com/troubleshooting-ssh-connectivity-issues/
For IPsec in pfSense you can adjust the MSS clamping size. I now use 1371.
Thanks a lot!
It seemed to fix it at first, but not for me either…
Denis
Thank you!!!! That has been driving me crazy for the last few days. I’ve been configuring a pfSense for our new external connection and switched to using it as my gateway to test.
As soon as I did that, and configured the VLANs on pfSense, the SSH to the switched kept bombing out after a couple of minutes.
I thought I had configured the VLANs wrong or that the box we are using wasn’t up to the task… Then I stumbled on your post.
Thanks it was a head banger!, my situation: a internal openvpn server, a ssh session from this openvpn tunnel on a virtual subnet internally.
The tcp sessions allway’s freezes at about 47s.
Thank you. You helped me a lot.
Many thanks from Ceará Brazil.
But just switch Firewall Optimization Options to Conservative solved this issue to me.
Best regards.
Wow. Finaly I was able to find the resolution to my SSH problems behind pFsense. Thank you very much for sharing this!
You’re good. Thank you sooo much Sir. I wasn’t able to find any solution for it and now it’s working flawlessly!
Oh man ! Sounds good. I try now. Thanks a lot 🙂
In fact nope.. It dont help me… Still disconnect… Thats nerve man….
You saved my life!
Thanks. This problem has vexxed me occasionally numerous times. Was for a netgate 7541 routing between interfaces.
This has been driving me insane for weeks. Thank you!!!!!!
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Thanks
Dear Sir/Madam,
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Thanks
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