Backup failed after timeout

[AlexeyTe]

Hi!

The backup was started. The tape has been loaded into the drive. Disk Agent started on the client server.
And nothing happens. Job logs show timeouts:

[Normal] From: **PERSONAL INFORMATION REMOVED** "E:" Time: 18.02.2021 13:41:18
STARTING Disk Agent for server-srv2.domain.com:/E "E:".

[Normal] From: **PERSONAL INFORMATION REMOVED** "F:" Time: 18.02.2021 13:41:19
STARTING Disk Agent for server-srv2.domain.com:/F "F:".

[Major] From: **PERSONAL INFORMATION REMOVED** "Task_day3" Time: 18.02.2021 15:41:23
[61:1002] The VBDA named "E:" on host server-fr3.domain.com
reached its inactivity timeout of 7200 seconds.
The agent on host will be shutdown.

[Major] From: **PERSONAL INFORMATION REMOVED** "Task_day3" Time: 18.02.2021 15:42:00
[61:1002] The VBDA named "F:" on host server-fr1.domain.com
reached its inactivity timeout of 7200 seconds.
The agent on host will be shutdown.

The debug.log file has entries:

2/18/2021 10:57:17 AM CHANGE_JOURNAL.10828.7448 ["/da/clp/win_ntfs/change_journal/DirectoryDB.cpp $Rev: 20234 $ $Date:: 2011-05-13 17:13:42":1370] A.06.20 b407
DirectoryDB::UnlockDB: Could not open directory database lock file (null)lck backupSpaceId = \Shares

2/18/2021 10:57:17 AM CHANGE_JOURNAL.10828.7448 ["/da/clp/win_ntfs/change_journal/DirectoryDB.cpp $Rev: 20234 $ $Date:: 2011-05-13 17:13:42":914] A.06.20 b407
DirectoryDB::Cleanup: Could not unlock the directory database with backupSpaceId \Shares

2/18/2021 10:57:19 AM VBDA.10828.7448 ["/da/bda/win32.c $Rev: 34480 $ $Date:: 2012-11-07 14:50:46":2159] A.06.20 b407
GetVolumeName failed for Mountpoint [/H] with error [123]

2/18/2021 10:57:19 AM VBDA.10828.7448 ["/da/bda/win32.c $Rev: 34480 $ $Date:: 2012-11-07 14:50:46":2159] A.06.20 b407
GetVolumeName failed for Mountpoint [\\?\H:] with error [123]

2/18/2021 10:57:20 AM VBDA.10828.7448 ["/da/bda/win32.c $Rev: 34480 $ $Date:: 2012-11-07 14:50:46":2159] A.06.20 b407
GetVolumeName failed for Mountpoint [\\?\H:] with error [123]

Populator::GetFullPathname: Could not find parent directory for parentRefNum 11. This is an error unless the index corresponds to the root directory (zero).
Populator::GetFullPathname: Could not find parent directory for parentRefNum 11. This is an error unless the index corresponds to the root directory (zero).
Populator::GetFullPathname: Could not find parent directory for parentRefNum 11. This is an error unless the index corresponds to the root directory (zero).
Populator::GetFullPathname: Could not find parent directory for parentRefNum 5715574. This is an error unless the index corresponds to the root directory (zero).

2/18/2021 11:08:08 AM DP_POP.8028.8364 ["/da/clp/win_ntfs/change_journal/db_populate/Populator.cpp $Rev: 17510 $ $Date:: 2011-01-31 19:39:19":446] A.06.20 b407
Populator::StreamToFile: Could not find full path for file ??????

2/18/2021 5:54:14 PM CHANGE_JOURNAL.12148.548 ["/lib/cmn/dbglog.c $Rev: 24973 $ $Date:: 2011-10-06 18:01:05":533] A.06.20 b407
###
RUNNING LOW ON MEMORY!
virtual total: -128 [KB]
virtual used: 85416 [KB]
physical total: 33553908 [KB]
physical used: 32937908 [KB]
commit limit: 88077460 [KB]
mem usage: 88072316 [KB]
mem usage: 99 [%]
###

What does error [123] mean and how can I fix it?

The servers are running constantly. They contain a lot of files that many people work with. Why is there a timeout?