Solving APC / Schneider Electric UPS PR_CONNECT_RESET_ERROR / ERR_CONNECTION_RESET / Connection Reset

Problem:

Web-browser reports PR_CONNECT_RESET_ERROR or ERR_CONNECTION_RESET when trying to manage APC via https.

Cause:

SSL certificate invalid.

Solution:

https://www.apc.com/us/en/faqs/FAQ000233142/

ssh -c aes256-cbc <IPAddress>
cd ssl
dir
delete <filename>.p15
reboot

HTTPS should work after restart.

Alternative Solution:

ssh -c aes256-cbc <IPAddress>
web -h enable 
reboot

Connect via HTTP and Delete the certificate via Web UI
Navigate to Configuration --> Network --> Web --> SSL Certificate --> Select “Remove” --> Apply.
Navigate to Control --> Network --> Reset/Reboot --> Select “Reboot Management Interface” --> Apply.

HTTPS should work after restart.

Revert HTTP to disabled if desired.

Recommended:

Update firmware, but newest firmware seemingly still using CBC ciphers. 😩

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good luck!