Hi @Dsinc 

Thanks for posting in our business forum.

Quite odd indeed. Sitting there, with no changes or anyone touched its config, it completely entered the situation where you cannot access them?

As you described, HTTP and SSH stopped working, have you checked if their ports are still open?

I would recommend you reboot one of them and check if it can recover. If it does not, you probably need to check if there is anything recently changed on your network environment. That might be a case where the access is blocked.

AFAIK, you can have tons of features to stop the access but still allow it to work.

You can have port security, ACL, and access control to stop the log-in. But it would presume it might be ACL you set on another switch in the network where your login PC is connected.

 Hi @Dsinc 

Dsinc wrote

Hi @Clive_A 

 

Thanks for your reply. As suspected a reboot of each switch was required to regain access. I have no idea what could have made them all go dark at the same time though - a malformed packet? Faulty hardware? Open to any theories.

Would NOT be possible AFAIK. It would be a software level thing. Not hardware I think.

If the packet is bad, it should be retransmit if you reconnect(or ping) to it. I think it might be a human error. It should not be failing in HTTP and ping at the same time unless it is rebooting.