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I found your answer:
HOW DO I LOG IN TO THE ALERT CENTRAL VIRTUAL APPLIANCE CONSOLE? WHAT'S THE ROOT PASSWORD?
Each Alert Central appliance has a unique root password that even we don't know in advance. You can use the default admin credentials (the same as the Virtual Appliance Management Interface) of admin/admin to log in and poke around if necessary.
If worst comes to worst, we do have the ability to decode the root password and provide it during troubleshooting/resolving issues.
...So if you don't have it recorded somewhere, call Solarwinds tech support and they can decode your root password for you.
I made a support ticket for them once to do just this, and they told me that they couldn't anymore because it was a free product and not supported :/
The appliances themselves do also have VMware Tools already present, though I've seen a warning generated due to the currency of the version on the appliance when compared to whatever VMware is checking for.
Old post but here's how I did it...
Reboot AlertCentral and enter the GRUB boot menu to modify the kernel arguments by adding "single" to the end of the line. When the server boots, you will be logged in as root. change the root password by typing passwd root. Then reboot the server.