WAN Accelerator Fails to Install

Verify The Issue

There are many reasons why a service may fail to start and display "Error 1920." As such, the first step is verifying that the service failed to start due to an invalid path.

1. Connect to the machine that is failing to be added/reconfigured as a WAN Accelerator.
2. Open the Veeam WAN Accelerator Service log:
   
   C:\ProgramData\Veeam\Backup\Svc.VeeamWANSvc.log
3. Go to the end of the file and search upward for the error:
   

   The system cannot find the path specified:
   

   In most cases, the error will be readily visible near the end of the log, as the WAN Accelerator service will dump the error that prevented it from starting as its last action before it terminates.
   
   Example:
   

   srv      | RootFolder = D:\VeeamWAN
   srv      | SendFilesPath = D:\VeeamWAN\Send
   srv      | RecvFilesPath = D:\VeeamWAN\Recv
   srv      | EnablePerformanceMode = false
   srv      | ERR |Fatal error
   srv      | >>  |boost::filesystem::create_directories: The system cannot find the path specified: "D:\"
   srv      | >>  |Unable to apply settings. See log for details.
   srv      | >>  |An exception was thrown from thread [11612].
   srv      | Stopping service...
   

4. If the path error was found, proceed to the next section.

Resolve the Invalid Path Issue

Having now determined that the path settings in the registry are causing the WAN Accelerator service to fail to start, you must determine if the drive letter specified in the error and settings is intended to be missing or not.

• If the drive letter shown in the error is supposed to exist on that machine, determine why it is missing and remedy the situation. Once the drive letter is again present, reattempt to create/reconfigure the WAN Accelerator within the Veeam Backup & Replication Console.
• If the drive letter shown in the error is expected to be missing, either:
  • Update the registry values' data to contain the correct drive letter, then reattempt to create/reconfigure the WAN Accelerator within the Veeam Backup & Replication Console.
    
    or
  • Remove the entire [HKLM\SOFTWARE\Veeam\Veeam WAN Accelerator] key, and allow it to be recreated when adding/reconfiguring the WAN Accelerator within Veeam Backup & Replication Console.

The WAN Accelerator folder path settings are stored in HKLM\SOFTWARE\Veeam\Veeam WAN Accelerator\ within the following values:

• HashRepositoryBasePath
• HashRepositoryGlobalDedupBasePath
• WanRootCachePath