Mail Transmission Agent running on the source server shows warning: 'NTA::Application::CopyFilesF (27447)

Mail Transmission Agent running on the source server shows:

'NTA::Application::CopyFilesFromFolder Warning 53 The network path was not found. Path:\\Target_server_name\QMMEX$Target_server_name$, User:domain\service_account'
NTA::Application::CopyFilesFromFolder TraceMsg 521 Creating the target server's folder '\\?\UNC\Target_server_name\QMMEX$Target_server_name$\Mail Transmission Agent\In\Source_server_name'.
NTA::Application::CopyFilesFromFolder Warning 524 Operation has been completed. Returned value: 53 (The network path was not found.)
NTA::Application::CopyFilesFromFolder Warning 526 Thread was not started because the target folder does not exists.

As a result, the PRV and/or PUB files are not moved to the target server.

Mail Transmission Agent cannot connect to the target server.

There are several possible issues that might cause the problem:

1. The service account used by the Mail Transmission Agent does not have permissions to connect to the target server and/or Aelita Exchange Migration Wizard folder shared as QMMEX$\target_server_name$. Please check whether the service account has been granted all appropriate permissions. Please refer to the Required Permissions section of the QMM User's Guide for details.

2. The NETBIOS name of the target server cannot be resolved when logged on to the source server. To check this, please log on to the source server where the Mail Transmission Agent is installed and ping the target server using its NETBIOS name. If it does not resolve correctly, please check the DNS and WINS settings. If the ping test is successful, attempt to reach the path specified in the log, using the service account credentials.

3. The target server is down. Please make sure the target Exchange server is up and running.