SQL Backup getting failed with errorEncountered a network error. Could not connect to the CVD on the target MediaAgent to launch the DDB engine.
5884 1be0 12/09 16:19:52 739 <SC: 191> LaunchGroupRemotePart1: Cannot connect to CVD on host [DPCBKP02*DPCBKP02*8400]. Error [0xE8090010:{CCvNetwork::Attach_RemoteDLL(1579)} + {CCvNetwork::Attach_RemotePort(1453)} + {CCvNetwork::GetConnection(3327)} + {CSessionConnectionSocket::GetConnection(240)/EventMessage.0x09000010.9:16.(Remote machine [DPCBKP02]. The socket connect failed. Error returned [-1=Connection failed on sqlclust01: Error in tunnel to DPCBKP02: Connect failed: Failed to connect fd=1096 to 172.18.3.27:8403: Connection timed out]. Check Network Connectivity.)}]
5884 1afc 12/09 16:19:52 739 <SC: 191> LaunchGroupRemotePart1: Cannot connect to CVD on host [DPCBKP02*DPCBKP02*8400]. Error [0xE8090010:{CCvNetwork::Attach_RemoteDLL(1579)} + {CCvNetwork::Attach_RemotePort(1453)} + {CCvNetwork::GetConnection(3327)} + {CSessionConnectionSocket::GetConnection(240)/EventMessage.0x09000010.9:16.(Remote machine [DPCBKP02]. The socket connect failed. Error returned [-1=Connection failed on sqlclust01: Error in tunnel to DPCBKP02: Connect failed: Failed to connect fd=1096 to 172.18.3.27:8403: Connection timed out]. Check Network Connectivity.)}]
5884 1be0 12/09 16:19:52 739 <SC: 191> Connect: Unable to send message to [DPCBKP02][DPCBKP02*DPCBKP02*8400] to launch engine [3] for group [0]. Error [Could not connect to the CVD on the target MediaAgent to launch the DDB engine. MediaAgent: DPCBKP02, DDB: CV_ERP_Databases_3, StoreId: 3, SubStoreId: 5]
5884 1afc 12/09 16:19:52 739 <SC: 191> Connect: Unable to send message to [DPCBKP02][DPCBKP02*DPCBKP02*8400] to launch engine [3] for group [0]. Error [Could not connect to the CVD on the target MediaAgent to launch the DDB engine. MediaAgent: DPCBKP02, DDB: CV_ERP_Databases_3, StoreId: 3, SubStoreId: 5]
5884 1be0 12/09 16:19:52 739 CSignatureQuery::ConnectSIDB() - <SC: 191> [ERROR] Failed to contact the SIDB engine [Could not connect to the CVD on the target MediaAgent to launch the DDB engine. MediaAgent: DPCBKP02, DDB: CV_ERP_Databases_3, StoreId: 3, SubStoreId: 5]
5884 1be0 12/09 16:19:52 739 CSignatureQuery::QuerySignaturesAsync() - <SC: 191> [ERROR] Connect SIDB faild (53002)
DDB is fine and same location , other backup is running. Port 8400 and 8403 is opened and same server client we are able to run filsystem backup.
