FB 5.0.1: error at the end of the backup process

[gsbelarus]

Server mode: Classic or Super (tested for both) Max parallel workers: 64 Parallel workers: 16

At the end of database backup gets the following message:

12:42:46,47 C:\Program Files\FB5>gbak -b "G:\XXXXXX.FDB" "G:\XXXXXXX.bk" -pas XXXXXXX -user sysdba -se localhost/3056:service_mgr
gbak: ERROR:Error reading data from the connection.
gbak:Exiting before completion due to errors

There is a record in the firebird.log:

XXXXXXXX	Wed Apr  3 12:57:23 2024
	INET/inet_error: read errno = 10054, server host = localhost, address = ::1/3056

Visually, the resulting bk file looks fine, though I didn't check how the database will be restored from it.