apcupsd? preventing ssh on power failure?

Hello

I had a power outage yesterday.

My server is powered by an APC UPS, running Slackware 15, with apcupsd.

I wanted to ssh into the server from a laptop to set up a script to count how long the UPS battery will last. But when I tried it, I got this:

Code:$ ssh 10.0.0.2
POWER FAILURE

POWER FAILURE

Connection closed by 10.0.0.2 port 22Also at some point later I noticed that I can't connect to Dovecot either.

When 1.5h later power was restored: everything went back to normal without any input from me.

Does someone know what is causing this? And what possible good reason there might be to block ssh access during a power failure?

Thanks in advance.