After Update Error Message: "Error 623" arises when I open FireFox

After Update Error Message: "Error 623" arises when I open FireFox

Now that I have completed the latest updates, I get this error message when
I open Firefox:

Error Message: "Error 623: The system could not find the phone book entry
for this connection."

The solution for this error message does not seem to be applicable here. In
other words I can’t find any ‘the Dial Another Connection “ checkbox in
Network Settings. I connect directly to the network through a network. (HELP
said: NOTE: If your VPN connection doesn't require a dial-up connection, be
sure the Dial Another Connection First checkbox is unchecked and click OK.)