If you get a page saying ‘Someone is currently logged into the APC Management Web Server. Please try again later.’ when trying to connect to a managed APC PDU via the web interface there are a couple of likely causes.
- Someone is connected via the serial port – this will always override any IP connection.
- The web interface is ‘stuck’.
If it’s number 1 then you’ll need to find the machine physically connected and disconnect the terminal session, but the fix for number 2 is quite simple.
Just telnet to the device, then log off. This will reset the APC Management Web Server and you’ll be able to log in.
Thanks to the APC forum for the hint.