NMC restarts after login

[BBoozer]

I have been hitting a wall finding issue like this. I have 2 of 3 devices in a remote office that shows the NMC restart after supplying login credentials, so I can never get in. One of them is sending SMTP messages out showing it restarts. On my end, all I see is a hang and eventual web page timeout. Monitoring pings shows it drop and restart. 

Ironically, the only reason I was logging in is to change the SMTP server address.

[Teken]

Please call out the model and what NMC firmware is currently installed. Both information can be obtained via the LCD Menu if present.

The model number can be seen physically on the face of the NMC card. The NMC has a watch dog timer and will reset the network link if it detects a problem.

I would highly suggest you move the Ethernet cable to another port and see the results. If there are three NMC in the same building having issues I would be looking at that switch really hard.

Especially the verbose logs on the switch to determine when this started and the frequency.

Questions Ask . . . 

[BBoozer]

Would LOVE to! However, as stated, REMOTE location. No IT on site. No one there I trust to understand what a UPS & PDU are, regardless of the big APC on it. 

Also, for those reading comments: DO NOT try to post on r/APC on Reddit. It is not for Schneider, but Animals in People Clothes (apparently a thing). Lots of posts about UPSs. 

[Teken]

Obviously your choices are quite limited if you’re not going on site or can’t trust anyone to move a Ethernet cable to another switch port / eye ball a label! 🤦‍♂️

Any serious remote installation would have at least VPN or KVM.

The most basic review of the switches verbose error logs must be seen. It will literally tell you if the port is having issues from flapping, RX/TX, packet dropped, etc.

In 2025 reviewing the logs from a Syslog, NMS, and the appliance itself is a minimum to be in place.

What do they show?!?