I randomly get RPC Server Unavailable on my Windows 2003 Remote Desktop Server. About 25 users connect to this server to run a legacy application. It probably happens once every couple days. When it happens, it pops up for every user who tries to connect. If they're already connected, they're fine. I have yet to find a fix, I have tried restarting different services and a few other things but nothing actually fixes it. Every time it just randomly clears itself up after maybe 10-15 minutes. I can reboot the server and it fixes for a day or so then happens again. Help!