Microsoft azure recovery services agent installation getting failed

Hi Lewies Thomas
It looks like you’re running into the classic MSI 1603 fatal-error when installing the Microsoft Azure Recovery Services (MARS) agent. Here’s a checklist of things to try that usually clear this up:

1. Run as local administrator
   • Right-click the installer and choose “Run as administrator.”
   • Make sure the account is in the Local Administrators group.
2. Validate prerequisites
   • .NET Framework 4.5.2 or later (you’ve got 4.8—good!)
   • Windows PowerShell installed and up-to-date.
   • Supported OS with latest Windows Updates applied (see supported OS list).
3. Clean up temp/cache folders
   • Delete any .tmp files under C:\Windows\Temp (especially if there are tens of thousands).
   • Make sure your scratch folder (cache folder) isn’t compressed, hidden, encrypted or system-attributed.
4. Check install directory permissions
   • Ensure the target install folder (by default C:\Program Files\Microsoft Azure Recovery Services Agent) doesn’t have weird attributes and that your user can write to it.
5. Disable antivirus/endpoint protection temporarily
   • Some AVs lock files during MSI install and throw a 1603.
   • Exclude the scratch folder and the install path from real-time scanning.
6. Review MSI install logs
   • Run the MSI with verbose logging: msiexec /i “AzureRecoveryServicesAgent.msi” /l*v install.log
   • Inspect install.log (or post relevant error lines here).
7. If re-installing/remediating:
   • Uninstall any previous MARS agent from Programs & Features.
   • Delete the “Microsoft Azure Recovery Services Agent” folder under Program Files and under ProgramData.
   • Reboot before attempting a fresh install.
8. Check system clock & proxy settings
   • Ensure the server’s time/timezone is correct.
   • If you’re behind a proxy, verify system-account proxy settings via PsExec (so the MSI can reach Microsoft URLs).

If none of that helps, please share a bit more info:

• What OS and build (e.g. Windows Server 2019, Windows 10 21H2)?

• Have you installed a MARS agent here before or is this a first-time install?

• Any error details in the MSI log (install.log)?

• Is there a proxy or firewall that might be blocking the installer?

• Which MARS agent version are you trying to install?

• Are there any Azure vault credentials already on the machine?

Hope this gets you unstuck—let me know the answers above and we’ll dive deeper!

References

1. Azure Recovery Services Agent install/registration issues https://docs.microsoft.com/azure/backup/backup-azure-mars-troubleshoot#installation-or-registration-issues
2. MARS agent prerequisites & supported OS https://docs.microsoft.com/azure/backup/backup-support-matrix-mars-agent
3. Uninstall and reinstall the MARS agent https://docs.microsoft.com/en-us/azure/backup/install-mars-agent
4. Cleaning up .tmp files and cache folder tips https://docs.microsoft.com/azure/backup/backup-azure-mars-troubleshoot#common-mars-configuration-errors

Error 1603 is a generic Windows Installer fatal error. For Microsoft Azure Recovery Services (MARS) Agent, common causes and fixes in the provided context are:

1. Make sure the latest supported MARS Agent is used
   • Older agents can fail installation or registration. Install the latest version of the Microsoft Azure Recovery Services agent from the Microsoft Download Center as indicated in the mandatory update articles.
2. If this is an upgrade/repair scenario, verify the MSI source in the Windows Installer cache
   • When upgrading or reinstalling, the setup may fail if the original MSI is missing from C:\Windows\Installer. The documented symptom is error 1612 during upgrade, but the underlying cause (missing cached MSI) can also surface as a generic 1603 failure.
   • To fix the missing MSI source for the MARS Agent:
     1. Exit the MARS Agent Setup/Upgrade Wizard.
     2. Open C:\Windows\Temp\OBPatch.log.
     3. Search for Warning: Local cached package. and find a line similar to: Local cached package 'C:\Windows\Installer\Unique_ID.msi is missing. Note the Unique_ID value.
     4. Run the MARSAgentInstaller.exe again but leave the wizard open.
     5. Open C:\Windows\Temp\OBInstaller0Curr.errlog.
     6. Search for Directory Path for SetupLaunchScreen and note the latest path, for example C:\Temp_ID.
     7. Browse to C:\Temp_ID\Installers and copy OBSAGENT.msi to C:\Windows\Installer.
     8. Rename the copied file in C:\Windows\Installer to Unique_ID.msi (the value from step 3).
     9. Close the wizard and run the installer again.
3. Ensure the agent version is current enough for vault registration
   • For configuration and registration to succeed, the guidance is to use MARS agent version 2.0.9249.0 or above. If an older version is being installed, download and install the current agent build instead.

If the installation still fails after confirming a current agent version and repairing the Windows Installer cache as above, the guidance is to contact Microsoft Support for further investigation.

References:

• Error when you try to upgrade the MARS Agent: The Microsoft Azure Recovery Services Agent update failed
• Troubleshoot the Microsoft Azure Recovery Services (MARS) agent
• Mandatory update for Microsoft Azure Recovery Services Agent
• Azure Backup Update for Microsoft Azure Recovery Services Agent: March 2017