Can't clear VTY line and can't access SSH

Hi @DiegoCJ,

This is Joey from the enterprise social support. I notice you posted a message on an old thread about clearing VTY. I'm unsure if VTY session would be related to your SSH connection issue. The recent update might have made some changes on SSH configuration or might have cleared them. Try checking them via local serial connection to the switch with telnet and reconfigure SSH. https://dell.to/3a5PHrM

Hi Joey
All SSH access is identified as a vty virtual session, and when it reaches 10 we cannot access via ssh. We have already upgraded to version 9.14(2.14) but the problem persists.

Hello DiegoCJ,

This may help: Enabling the System to Clear Existing Sessions

https://dell.to/3NIkg5E

Hi Charles,

I Tryed but dont't work.

Hello DiegoCJ,

Did it produce any errors or fault message you can share?

Was this issue occurring before the update?

Have you customized Concurrent Session limits?

https://dell.to/38TAp9E

Hi Charles 

There are no logs and Dell support has always said that it is necessary to update but they don't give a better solution

Some screenshots of the current status

Hello DiegoCJ,

The second image did not come through. Could you repost it?

What do you get if you try:

Dell#configure

DellEMC(config)#login concurrent-session clear-line enable

Can you provide more feedback when you say you tried, the steps on the article provided, but don't work:

What part did not work?

What was the result of the attempt?  (more screenshots of the effort may help.)

Was this issue occurring before the update?

Has it ever worked and if so do you know of anything that was done around the time it quit working?

 Enabling the System to Clear Existing Sessions

https://dell.to/3x4eZ2G

Everything indicates that the SSH process is stuck

Hi @DiegoCJ,

Could you run a show tech support to check the ONIE and Firmware Updater version? 

I spoke to one of my co-worker in networking about your issue, and he mentioned that he has some suspicion on the SSH configuration. You mentioned you have contacted Dell support? - Have you tried asking them to check the SSH configuration? It's an analysis of the switch configuration logs.

OK I will collect this information

Thanks

We are facing the same issue with some Dell S4048-ON switches that were recently updated to version 9.14 (2.14).

We can't connect via SSH or Telnet. When we connect by console we see that there are no users using the VTY and we do not see a high use of CPU or management-CPU.

We tried disabling and enabling the SSH and Telnet services, but the problem was not solved.

There are already 04 switches out of a total of 30 upgraded switches that have the same problem.

We will make a ticket to Dell with the background that we have collected.

We ran some more tests and found that the problem itself is the ssh service.

We were able to connect to the switch by console and when performing a "show ip server", we see that the service is enabled. When trying to disable it with the "no ip ssh server enable" command, the console would get stuck without responding.

After a while, we recovered the connection through the console and we were able to verify that the service remained enabled, despite having executed the command to disable it.

Finally, we then decided to reboot the switch and connect again by console. This time the ssh service was disabled.

I don't think rebooting a switch is a valid workaround.

Does anyone have another clue about this issue?

Still have no answer from Dell.