Unable to communicate with proofer

Cause

The server was unable to open a connection to the printer. This can occur if:

The server was started when the proofer was turned off,
The IP address for the proofer was not entered correctly, or
the IP address of the proofer was changed.
Printer is on a remote connection (different location / building)
Printer is connected to the network with more than 1 switch, or on a bad switch box (ideally, network switch boxes should never be used)
Printer is connected with old or cracked cables.
For Epson printers, Epson B-directional Service may have failed.
Printer may be disabled due to Network Scanning software interference.
On newer printer models, the SNMP communication may be disabled.
Controller Windows Network adapter drivers are out of date
Controller Windows Network adapter driver settings allow the ethernet card to go to sleep
Controller Windows Operating system is corrupt or out of date
Controller is running other software, that uses too many ports.
Printer Ethernet card is operating poorly, or has failed.

Check the following:

The proofer is turned on when you start the Controller.
The proofer is connected correctly to the Controller.
For Epson proofers, make sure the IP address set in the proofer matches the IP address set in the Controller.
check all cables and connections
Remove network switch boxes
Relocate printer to a local network connection.
Update Windows controller with latest drivers, firmware, and OS software
Remove any additional software on the controller. (controller should be dedicated for KPS use).
Run all PC and network diagnostics.
Reset printer communications. See Resetting Proofer Network Connections

If the problem persists:

Close the proofer client software.
Delete the spooler for the proofer. For example, on a Windows operating system, click Start > Settings > Printers and Faxes, and delete the proofer.
Start the proofer client software.
If the problem persists, create an error report, and contact your service representative.