The web interface on a Raritan Dominion PX device was not accessible. In order to fix the issue via the clp (cli) we plugged a console cable in with the following settings
Data Rate: 9600 Parity: None Data Bits: 8 Stop BIts: 1 Flow Control: off
When connected select : clp
You will then be prompted for the admin username and password.
To restart the management interface type
clp:/> reset /system1
This does not affect the power outlets.