I have Norton SystemWork and Firewall. Today the firewall was updated through LiveUpdate. After the update, it blocked thunderbird from contacting the pop sever. Other program such as firefox is unaffected. I know norton firewall is the source as it works after norton firewall is disabled. I tried the usual trick: reboot the computer, delete thunderbird from the list of program control by norton firewall and add it again by manually configured it by explicily saying accept everything for thunderbird but it still doesn't work. In fact, the computer froze a number of time during the set up in norton firewall? Any idea?