could not login to customer portal from my registered machine

Obviously I am logged in but this is from another linux machine which is not the one I registered for support.  When I logged in from that machine, I got "Internal Server Error".  "The server experienced a problem which prevented your request from being filled out.  It may not be possible to execute this action at this time.  Please help us correct this problem by
contacting us with details of how you recieved this error."  Clicking on the link went to a document page. 

Since I was already logged on from one location, does it not allow multiple logins?  Or is there something with my setup it is hanging up on?