SharePoint Fails to Syncronize with other Web servers in the farm after an Admin Change

Most likely you have changed the port number for the Administration web site via IIS. You must use stsadm to change this port number. From the help file:

Changing the Administration Port

You can change the administration port for your server to a port that is easy to remember or that is a standard installation port number for your organization. To change the administration port, use the setadminport operation. The setadminport operation takes the port parameter (specifying the new port number).

Changing the administration port can only be done from the command line. You must use the Stsadm.exe tool on the server computer itself to change the administration port. To change the administration port, use the following syntax:

 Stsadm.exe —o —setadminport —port <port>