I am glad to hear that it is working,maybe it had something to do with
what was mentioned by Evelyn, for me earthlink( server) had access to Keychain so it would change Network config. i just had to turn off Scamblocker.
Perhaps trashing the Keychain,got rid of server access of that type?? Can't say for sure.
Horray , it works.
Regards Eme:-{)