Graveyard shift

I thought I would never have to speak those words again, but it turns out I'm involved with a network change tonight @ 11PM. Our client has been having performance issues ever since they switched ISPs, so they want me on site to troubleshoot after hours. I don't really have much tools at my disposal, but I'm going to be thorough and hopefully spot the problem and fix it. That is if I can get inside the building tonight!