Hello,
Hard to tell what's happening but this type of error may be caused by newly installed or upgraded computer security products such as Norton or McAfee firewalls. If you have recently installed security software or recently changed the settings, make sure FrontPage has permission to access the Internet.
Your description of signon is a bit unusual, so I'm not sure how you are working with FrontPage. The usual scenario is to open in FrontPage your web site files residing on your own computer. Then when finished editing, select the File menu and choose Publish Site. Publish to
http://yourdomain.com.
To run a test, you can also open in FrontPage live on the server by selecting the FrontPage File menu and choosing Open Site. Open web location
http://yourdomain.com.