Error codes below relate to program navigation and related network communication errors:

Error numberError messageAdditional info and instruction
7021Unable to communicate with the testing server. Please contact your administrator. Contact your local system or network administrator; the network connection was either not found or the connection was lost during navigation. 

This is usually the result of a network connectivity problem. Verify the network connection, and try again.  

If you cannot connect after the second attempt, close TestNav. Fix any network connectivity issues. Check that the testing machine is connected to the school's network. Check ethernet cables or wireless connections, routers and switches, and so on. Check that proctor caching is running on any proctor caching computer in use and that the appropriate ports are open in the firewall. When a working network connection is confirmed, try again. After the connection is restored, check the student's test status in the administrative application and reset, if needed. Then, you can resume the student's testing session and have the student log in.  
7022Unable to communicate with the testing server. Please contact your administrator. Contact your local system or network administrator; the testing server URL that was requested was not found (404) or there was an internal server error (500) during authentication.  

This is usually the result of a network connectivity problem. Verify the network connection, and try again. 

If you cannot connect after the second attempt, close TestNav. Fix any network connectivity issues. Check that the testing machine is connected to the school's network. Check ethernet cables or wireless connections, routers and switches, and so on. Check that proctor caching is running on any proctor caching computer in use and that the appropriate ports are open in the firewall. When a working network connection is confirmed, try again. After the connection is restored, check the student's test status in the administrative application and reset, if needed. Then, you can resume the student's testing session and have the student log in. 
7023Unable to communicate with the testing server. Please contact your administrator. Contact your local system or network administrator; there was a parser error (bad data was sent from the application to the engine or from the engine to the server) during authentication. The user's login information was sent to the server, but either it or the response was empty, malformed, or corrupted.  

This is usually the result of a network connectivity problem. Verify the network connection, and try again.  

If you cannot connect after the second attempt, close TestNav. Fix any network connectivity issues. Check that the testing machine is connected to the school's network. Check ethernet cables or wireless connections, routers and switches, and so on. Check that proctor caching is running on any proctor caching computer in use and that the appropriate ports are open in the firewall. When a working network connection is confirmed, try again. After the connection is restored, check the student's test status in the administrative application and reset, if needed. Then, you can resume the student's testing session and have the student log in.  
7024Unable to communicate with the testing server. Please contact your administrator.Contact your local system or network administrator; the transmission timed out during navigation. 

This is usually the result of a network connectivity problem. Verify the network connection, and try again.  

If you cannot connect after the second attempt, close TestNav. Fix any network connectivity issues. Check that the testing machine is connected to the school's network. Check ethernet cables or wireless connections, routers and switches, and so on. Check that proctor caching is running on any proctor caching computer in use and that the appropriate ports are open in the firewall. When a working network connection is confirmed, try again. After the connection is restored, check the student's test status in the administrative application and reset, if needed. Then, you can resume the student's testing session and have the student log in.  
7025There has been a problem loading this item. Please contact your administrator.Contact your local system or network administrator; the transmission aborted during navigation. 

This is usually the result of a network connectivity problem. Verify the network connection, and try again.  

If you cannot connect after the second attempt, close TestNav. Fix any network connectivity issues. Check that the testing machine is connected to the school's network. Check ethernet cables or wireless connections, routers and switches, and so on. Check that proctor caching is running on any proctor caching computer in use and that the appropriate ports are open in the firewall. When a working network connection is confirmed, try again. After the connection is restored, check the student's test status in the administrative application and reset, if needed. Then, you can resume the student's testing session and have the student log in.