it is a know issue that Agents with 1.5 fail, if a license for 2.0 is added.
Veeam Backup and Replication
• Veeam Agent for Windows license added to Veeam Backup and Replication console will cause existing Veeam Endpoint Backup 1.5 jobs to fail. To work around this issue, delete the Beta license file from the console.
[02.02.2017 08:33:40] <01> Info ------- Veeam Manager Started -------
[02.02.2017 08:33:40] <01> Info Execution environment has been initialized to Local
[02.02.2017 08:33:41] <01> Info Licensing status:
[02.02.2017 08:33:41] <01> Info License has no expiration date.
[02.02.2017 08:33:41] <01> Info Hyper-V sockets: 'XXX'.
[02.02.2017 08:33:41] <01> Info vSphere sockets: 'XXX'.
[02.02.2017 08:33:41] <01> Info Licensing status:
[02.02.2017 08:33:41] <01> Info License has no expiration date.
[02.02.2017 08:33:41] <01> Info Hyper-V sockets: 'XXX'.
[02.02.2017 08:33:41] <01> Info vSphere sockets: 'XXX'.
[02.02.2017 08:33:41] <01> Info File "C:\Program Files\Veeam\Backup and Replication\Backup\plugins.xml" does not exist.
[02.02.2017 08:33:41] <01> Info Loading plug-ins. Number of platforms: "0".
[02.02.2017 08:33:41] <01> Info REMOVELICENSE
[02.02.2017 08:33:41] <01> Info [vaw]
[02.02.2017 08:33:41] <01> Info Removing license
[02.02.2017 08:33:41] <01> Error Unsupported license type [vaw] (System.Exception)
[02.02.2017 08:33:41] <01> Error bei Veeam.Backup.LicenseLib.SLicenseRemoverHelper.PraseLicenseType(String licenseTypeString)
[02.02.2017 08:33:41] <01> Error bei Veeam.Backup.LicenseLib.SLicenseRemoverHelper.TryChooseLicenseType(String[] arguments, ERemoveLicenseType& removeLicenseType)
[02.02.2017 08:33:41] <01> Error bei Veeam.Backup.Manager.Program.RemoveLicense(String[] arguments)
[02.02.2017 08:33:42] <01> Info [Ssh] Clearing connection cache
[02.02.2017 08:33:42] <01> Info [Ssh] Connection cache cleared
[02.02.2017 08:33:42] <01> Info ------- Veeam Manager Stopped -------
Yesterday I succesfully removed the beta license with Veeam.Backup.EnterpriseService.exe -removelicense vaw and tested that backups were working. But this morning the license was again there and now Veeam.Backup.EnterpriseService.exe -removelicense vaw does nothing. I have rebooted the server couple of times and still no luck. Is there any other way to remove the beta license?
Actually I was originally using Veeam.Backup.Manager.exe -removelicense vaw by mistake which didn't remove the license completely since we are using EM. But the KB article did the trick, thanks!
Am I correct in thinking that you tried the Veeam Agent for Windows (beta) with a trial license to protect the data to a Veeam Backup & Replication repository? And that you also have Veeam Endpoint Backup (1.5) installed and that those were also pointing to that same VBR repository?
I'm afraid this is not a supported scenario. From the moment you add a license into B&R, it expects that every agent (or endpoint) that connects to a B&R repository will then consume a license. Unfortunately, 1.5 does not have that licensing logic so it cannot work anymore.
As far as I know, to get your endpoints running again, you will need to remove that license.