Hello.
You could change configuration with setparam SMS/GPRS command:
https://wiki.teltonika-gps.com/view/FMA_setparam
parameters for FM1100 and FMA120 are the same:
server domain: 1245
server port: 1246
For example to change server domain to myserver.com, send:
"SMS_login SMS_password setparam 1245 myserver.com" or if there is no SMS login and password set, leave two empty spaces at the beginning: " setparam 1245 myserver.com"
Please send cpureset command after reconfiguring target server port and domain.
Regards