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SentinelOne Blocking Veeam Mount Server During FLR (Interoperability vs Performance Mode)

  • May 26, 2026
  • 5 comments
  • 28 views
Jean.peres.bkp
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We are facing an issue where SentinelOne is blocking our Veeam Mount Server, even when the operation is happening on the same server (VBR Windows).

These errors occurred after attempting a File Level Restore (FLR):

 

 

 

  • We tested using Interoperability mode, but the error persisted.
  • We then tested using Performance mode, and the restore was successfully mounted.
  •  

 

Has anyone experienced this behavior before or found a workaround?

Best answer by coolsport00

Hi ​@Jean.peres.bkp - did you set exclusions for Sentinel per Veeam KB1999?

https://www.veeam.com/kb1999

Saw this article which suggested to do so.

https://inventivehq.com/knowledge-base/sentinel/how-to-configure-sentinel-exclusions-for-veeam-backup-replication

Not found or seen anything related to your specific issue though.

Jean Sczepanski Peres | Pre-Sales | Data Protection Architect | Technical leader | VMCA - VMCE

    5 comments

    coolsport00
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    • coolsport00
    • Veeam Legend
    • Answer
    • May 26, 2026

    Hi ​@Jean.peres.bkp - did you set exclusions for Sentinel per Veeam KB1999?

    https://www.veeam.com/kb1999

    Saw this article which suggested to do so.

    https://inventivehq.com/knowledge-base/sentinel/how-to-configure-sentinel-exclusions-for-veeam-backup-replication

    Not found or seen anything related to your specific issue though.

    Shane Williford - Veeam VMCA/VMCE | Veeam Legend | VUG Leader | VCP-DCV | Twitter: @coolsport00
      eblack
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      • eblack
      • Influencer
      • May 27, 2026

      We use S1 pretty heavy. The mount server exceptions are key. ​@coolsport00 provided those above. Likewise, Defender should have them if in use. 

       

       

        Jean.peres.bkp
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        • Jean.peres.bkp
        • Author
        • Veeam Legend
        • May 28, 2026

        Hi ​@Jean.peres.bkp - did you set exclusions for Sentinel per Veeam KB1999?

        https://www.veeam.com/kb1999

        Saw this article which suggested to do so.

        https://inventivehq.com/knowledge-base/sentinel/how-to-configure-sentinel-exclusions-for-veeam-backup-replication

        Not found or seen anything related to your specific issue though.

        That's right, thank you!

        Jean Sczepanski Peres | Pre-Sales | Data Protection Architect | Technical leader | VMCA - VMCE
          Jean.peres.bkp
          Forum|alt.badge.img+8
          • Jean.peres.bkp
          • Author
          • Veeam Legend
          • May 28, 2026

          Hi ​@Jean.peres.bkp - did you set exclusions for Sentinel per Veeam KB1999?

          https://www.veeam.com/kb1999

          Saw this article which suggested to do so.

          https://inventivehq.com/knowledge-base/sentinel/how-to-configure-sentinel-exclusions-for-veeam-backup-replication

          Not found or seen anything related to your specific issue though.

          Excellent, thank you!

          Jean Sczepanski Peres | Pre-Sales | Data Protection Architect | Technical leader | VMCA - VMCE
            coolsport00
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            • coolsport00
            • Veeam Legend
            • May 28, 2026

            No problem at all ​@Jean.peres.bkp . Glad to provide an assist bud. Have a great weekend!

            Shane Williford - Veeam VMCA/VMCE | Veeam Legend | VUG Leader | VCP-DCV | Twitter: @coolsport00
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