From time to time Putty will become unresponsive and displays “ATZ”. This is due to the HylaFax – FaxGetty’s software modems that causes this problem.
The only way we could find getting around this problem is by disabling the modems (and faxes) while you work on the server and enabling them afterwards. The problem with this is that you can not kill or stop FaxGetty like other services. You need to edit the /etc/inittab and comment the FaxGetty modem lines at the bottom of the file. Thereafter save the file and restart inittab by executing #kill – HUP 1 from the bash. When you are done, undo your inittab changes and restart inittab.
Easy as pie.