I have TB on a desktop running Windows 8 and also on a laptop running Windows 7. For no apparent reason the desktop TB stopped connecting to both the incoming and outgoing servers today. (It just hangs, then sends me a "failure to connect" error message, when I try to fetch or send mail.) TB on my laptop is working fine, so the problem clearly isn't with the mail host. Nor is it the account settings, which are the same on both computers. I tried restarting TB, then restarting the computer. No luck. Running TB in safe mode didn't help either. While I do use a security program, that's not the problem here. I say this because (a) I'm not receiving any notifications that it's blocking TB, (b) TB is on a list of trusted programs, and (c) I use the same security program, with the same settings, on my laptop, and TB is running fine there.

Any suggestions?