I had to reset my DMP 4305G to factory defaults after redeploying DMP to a new location.
I have static IPs assigned to the DMP, but it would not let me get pass the login screen without changing the password.
Once I changed the password, the DMP no longer shows up on the DMM as connected, and I can not push any commands to it.
Navigate to Digital Signs,Settings,Server Settings and change the username and password to match the new one.
Note that this will effect all DMP so make sure that you have the same login credentials on all DMPs.