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Backup Retention Policy Error – RPC Function ‘FcIsExists’ Failure

  • October 30, 2025
  • 7 comments
  • 54 views
Z

Hi Veeam Community,

I’m running into a critical issue with my backups and need help.

Error Details:

Unable to apply retention policy: failed to delete backup files
Error: Failed to call RPC function 'FcIsExists': The specified network name is no longer available.

Environment:

  • Veeam Backup & Replication: v12.3.2.3617
  • Backup Repository: NAS
  • OS: Windows 10

What I’ve tried:

  • Deleted ~300GB of old backup files to free up space.
  • Verified repository free space.
  • Restarted Veeam services and checked network connectivity.

Despite this, all backups are failing. The error seems tied to retention policy cleanup and possibly network access to the NAS.

Chris.Childerhose
coolsport00

7 comments

coolsport00
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  • coolsport00
  • Veeam Legend
  • October 31, 2025

Hi ​@Zacls3 -

Did you look at this Veeam KB? Looks like you might have an incorrect NAS password:

https://www.veeam.com/kb1492

Try to update your NAS credentials and see if that resolves the issue for you.

Best.

Shane Williford - Veeam VMCA/VMCE | Veeam Legend | VUG Leader | VCP-DCV | Twitter: @coolsport00
Z
Z
  • Zacls3
  • Author
  • Not a newbie anymore
  • October 31, 2025

Hi ​@Zacls3 -

Did you look at this Veeam KB? Looks like you might have an incorrect NAS password:

https://www.veeam.com/kb1492

Try to update your NAS credentials and see if that resolves the issue for you.

Best.

Thanks mate I will have a look at this!

Chris.Childerhose
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  • Chris.Childerhose
  • Veeam Legend, Veeam Vanguard
  • October 31, 2025

See if this KB helps - https://www.veeam.com/kb1492

A support case would not be bad either.

Chris Childerhose - VMCA2024 | VMCE2023 | VMCE-SP2024 | Veeam Vanguard 8* | Veeam Legend 5* | VUG Canada Leader | vExpert 6* | Toronto VMUG Leader | VCAP-DCV/VCP-DCV | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech
Z
coolsport00
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  • coolsport00
  • Veeam Legend
  • October 31, 2025

​@Zacls3 - no problem. Let me know how it goes.

Shane Williford - Veeam VMCA/VMCE | Veeam Legend | VUG Leader | VCP-DCV | Twitter: @coolsport00
Z
S
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  • SCSIraidGURU
  • Comes here often
  • October 31, 2025

Did you do a NSLookup on the network name?  Did you try pinging it?  

lukas.k
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  • lukas.k
  • Veeam Vanguard
  • October 31, 2025

Another recommendation: You mentioned you deleted some old backups. Please make sure that you always delete them using the Veeam GUI so that these restore points also get deleted from your Veeam config database.

Deleting them on the file system of the repository is not always a good idea.

I’d go with all the recommendations above, a ticket should help in any way.

LK | Veeam Vanguard | VUG Leader - Cyber Security Space | Security Specialist
Marcel.K
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  • Marcel.K
  • Veeam Legend
  • October 31, 2025

From my point of view looks that some port is blocked like 6162. Try to rescan repository to see, if everythjng is fine.But as well i would suggest to log on repository with user, which is used by Veeam and try to create file. Maybe you will find something with else like permission ....

Marcel Kačmár | VCSP Partner 2022 | VMCE 2024 | VMCA 2024 | Veeam Legend 2025 |
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