SQL Server Backup To a NAS Box I'm trying to backup to a NAS box but I'm getting the following error:

Cannot open backup device '\\nas02\backup\SQL\instance\Full-Backups\OtherDBs\Daily\MGMT_TEST.bak'. Operating system error 1326(failed to retrieve text for this error. Reason: 15105).
Msg 3013, Level 16, State 1, Line 2
BACKUP DATABASE is terminating abnormally.


This was working before and I have checked permissions to the location by logging onto the server as the account sql is running under and I can go to the location above. From there i can create new files and update existing ones etc.


There is no space limitation
The user running the statement is a sysAdmin


I'm thinking some permissions of some type but struggling to see how.
It means either it's permission issue or you are running out of space on target.

Permission Issue

The service account of SQL Server (which used to start SQL Server service) does not have access to the target.

START > RUN > type SERVICES.MSC.

Find SQL Server Service > Right click and go to PROPERTIES.

Go to LogOn/Security tab

If it's system account (NETWORK SERVICE, LOCAL SYSTEM etc.) then change it to any specific account (domain account like ex. dba\sqlserviceact).

Then restart SQL Server Service.

And grant the account (ex. dba\sqlserviceact) read &amp; write privilege on the shared folder (network path).

If it's other then system account the grant the account ready/write privilege.

Thanks