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M4300 Stack (XSM4335FS + GSM4328S) -- Web, SSH, and SNMPv3 all stopped working
I have a stack consisting of 4x M4300-35FX (XSM4335FS) and 2x M4300-28G (GSM4328S) switches using a single management IP. This stack has been in production use for 5+ years and has received numerous firmware upgrades. We received an alert from our monitoring system that SNMPv3 went down, and upon investigation found that the web UI and SSH access are also no longer responding. The switches are still passing traffic normally, but all management access appears to be down. Has anyone seen this before or know what might cause the management plane to stop responding like this? Any advice would be greatly appreciated. Firmware version: 12.0.19.10