How to troubleshoot and fix dial-up connection errors with cellular modems
Use the AT Command Tester tool to troubleshoot dial-up connection errors,
- How to setup dial-up connection?
- Fix dial-up connection error 623 – The system could not find the phone book entry for this connection.
- Fix dial-up connection error 628 – The connection was terminated by the remote computer before it could be completed
- Fix dial-up connection error 678 – The remote computer did not respond. To make sure that the server can be reached, ping the remote computer
- Fix dial-up connection error 663 – The modem (or other connecting device) is already in use or is not configured properly
- Fix dial-up connection error 692 – There was a hardware failure in the modem (or other connecting device)
- Fix dial-up connection error 756 – This connection is already being dialed
- Fix dial-up connection error 777 – The connection attempt failed because the modem (or other connecting device) on the remote computer is out of order