If you run into the less than helpful message “ERROR: Invalid IP address” when trying to use the Virtual Connect Support Utility (vcsu for short) because you haven’t had to use that tool in a while, or ever: make sure you’re using the IP address and credentials of your Bladecenter OA and not the IP address of your VC device you want to update/check/whatever.
Turns out vcsu logs into your OA first, checks which VC interconnects are installed and goes from there. You’ll have to enter your VC login credentials at a later stage once the initial assesment is done.