It is possible to set a password in Handyman Office, so that the mobile user cannot change the IP address for synchronization without entering this password on the mobile device. (Handyman Office -> System -> Settings -> Synchronization)
To see what the password is you click the lock sign and the password will appear
On the device it will look like this when the server address is locked:
When you click the lock you will be able to write the password to unlock: