CIMC - The maximum number of user sessions has been reached.

When building our first Cisco UCS server, I somehow managed to consume the maximum amount of web browser sessions on the server's CIMC and was receiving 

The maximum number of user sessions has been reached. 

This can be resolved by using SSH to the CIMC IP address and logging in with the administrator credentials. Once in, the active sessions can be viewed using

show user-session

 To change into the context of the user session enter the following replacing sessionindex with the session number

scope user-session sessionindex

To kill the session enter;

terminate

To escape the user session type

exit

Also if necessary the CIMC can be rebooted independently from the server chassis by entering

scope cimc

Once in the CIMC scope 

reboot

Answer 'y' to the prompt to reboot the CIMC