[firebird-support] nbackup - Problem on "attach database"

[nils_andern...@yahoo.de [firebird-support]]

Hi,
  
 I have a problem and my ideas to solve it are getting to an end. Hopefully you 
can help me. 
  
 When I try to make a backup with nbackup on our customer’s system (Windows 
Server 2016 – Firebird 3.0.3) we get the following message, while we are 
connected to the database with the “IBExpert” at the same time. When we are not 
connected, the backup will run.
  
 d:\SYSTEM\Firebird_WORK\nbackup.exe -U SYSDBA -P mypassword -B 0 
D:\DATENBANK\SHS.FDB D:\DATENBANK\SHS_Backup_Work_0_Test.nbk
 [
 PROBLEM ON "attach database".
 I/O error during "CreateFile (open)" operation for file 
"D:\COMED\DATENBANK\SHS.FDB"
 -Error while trying to open file
 -The process cannot access the file because it is being used by another 
process.
 SQLCODE:-902
 ]
  
 When I try it on my local machine there is no problem even when I access the 
database with the IBExpert and make a nbackup at the same time. I double 
checked the settings in the IBExpert and they seem to be identical. I am not 
sure what the cause of the problem is: Firebird, IBExpert, some settings 
(Firebird, IBExpert), perhaps the Anti-Virus software…
 The Firebird Log does not give any hints.
  
 Does anyone have an idea what I can do or what I can check to solve this 
issue. 
  
 Best regards
 Nils Andernach