How to fix Canon Printer Error Code 751? Canon Printer Error Code 751 occurs because of 1. The server is not functioning. The network is not connected. (The server may be unable to connect to the network, or it may have lost the connection.) 2. The IP address is not set. 3. You were unable to send to an SMB server (including the Advanced Space of another image RUNNER ADVANCE series machine made accessible by SMB), because Windows (SMB) is being used to browse file servers. Problem 1 : The server is not functioning. The network is not connected. (The server may be unable to connect to the network, or it may have lost the connection.) Solution 1 Make sure that the server is ON, and check the destination. Check the status of the network.