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Unexpected proxy address format - Error After Upgrading to Veeam Backup for Microsoft 365 6.0 P20220524

KB ID: 4319
Product: Veeam Backup for Microsoft 365
Version: 6.0.0.385 (P20220524)
Published: 2022-06-10
Last Modified: 2022-06-14
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Challenge

After upgrading to Veeam Backup for Microsoft 365 6.0 P20220524, the mailbox backup for organizations added as Hybrid or Microsoft 365 may fail with the error: 
 Error: Unexpected proxy address format: x500:/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=6a988fc15d474a1b9879943428200487-:

Cause

The SMTP address of a mailbox contains the ":" symbol.

Solution

HotFix Installation Instructions:

  1. Ensure you are running Veeam Backup for Microsoft 365 build 6.0.0.385 (P20220524)
  2. Ensure that there are no Backup jobs or Restore sessions running.
  3. On the Veeam Backup for Microsoft 365 server, stop the following services:
    • Veeam Backup for Microsoft 365
    • Veeam Backup Proxy for Microsoft 365
  4. Download the hotfix via the button below.
  5. Extract the fix to: C:\Temp\KB4319\
  6. After extraction, unblock the file using the following PowerShell cmdlet:
Get-ChildItem -Path "C:\Temp\KB4319\" -Recurse -Force | Unblock-File
  1. Backup the original DLL and replace it with the one from the fix in the following locations:
    • C:\Program Files\Veeam\Backup365\Veeam.Azure.ActiveDirectory.v11.1.0.dll
    • C:\Program Files\Veeam\Backup365\Packages\Proxy\Veeam.Azure.ActiveDirectory.v11.1.0.dll
  2. Start the services that were stopped in Step 3.
  3. Upgrade the Backup Proxy Servers.

Download Information

DOWNLOAD HOTFIX
MD5: 8461913DBFA8D8E0664E4CB441434A82
SHA1: 5FFEB2EFF1141FBCB93E60DA70BF7D0F09DDC677
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