OK, sorry...I know that you said that it had been working previously, but I didn't know that it had been working for 6 months. What release of Win7 are you using and what release were you using 6 months ago? I am just guessing but when you went away perhaps you installed or upgraded or just updated some third party software like a firewall product or and antivirus / Internet Security Suite with a firewall addin, or Itunes /bonjour /mdnsresponder or an Adobe product which installs a bonjour/mdnsresponder type product. Check task manager and see if bonjour or mdnsresponder is running also check services.msc and see if there is a pecurliar string at or near the top that contains a bunch of numbers and or characters. If so set them all...