OnedriveRestore Explorer not connection after 8.4 Update

[DaStivi]

i just started Troubleshooting, but it looks like the Onedrive Restore Explorer doesn't connect anymore after 8.4 Update...

Code: Select all

[11.05.2026 12:12:26.755]          21 (1)       [Info] Connecting to Veeam Backup for Microsoft 365 server at 127.0.0.1:9194...
[11.05.2026 12:17:27.303]          21 (1)       [Info]  Connection failed
[11.05.2026 12:17:27.310]          21 (1)      [Error] Error: Timeout has expired: 300000 milliseconds.
[11.05.2026 12:17:27.310]          21 (1)      [Error] Type: System.TimeoutException
[11.05.2026 12:17:27.310]          21 (1)      [Error] Stack:
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.ThrowHelper.ThrowOperationTimeout(Int32 timeoutMilliseconds, Exception innerError)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.MethodCall.ExecuteCallInternalAsync()
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.MethodCall.ExecuteCallAsync()
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.LoggingInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.MetricsInterceptor.MeasureAsync[T](Func`1 fn)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.MetricsInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.TelemetryInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.InvokeAsync(InvokeArg invokeArg)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.<>c__DisplayClass8_0.<Invoke>b__0(Task _)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at System.Threading.Tasks.ContinuationResultTaskFromTask`1.InnerInvoke()
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
[11.05.2026 12:17:27.310]          21 (1)      [Error] --- End of stack trace from previous location ---
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
[11.05.2026 12:17:27.310]          21 (1)      [Error] --- End of stack trace from previous location ---
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.Invoke(InvokeArg invokeArg)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.InvokeProcessor.Invoke(InvokeArg invokeArg)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider._RemoteProxy.Invoke_ReturnVoid_WithParameters(InvokeArg invokeArg, String methodName, Object[] parameters)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at VCF.RuntimeAssembly.Proxy.4336b073-f5ff-4285-a124-930290391478.InitiateRpcSession(Guid)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.Rpc.RpcServiceReconnectHandler`1.BeforeGetChannel(TService channel)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Engine.Communication.PrimitiveServiceClient`1.GetChannel(Boolean canReconnect)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.SharePoint.Archiver.Remote.SharePointArchiverConnector.VerifyControllerVersion(IPrimitiveServiceClient`1 archiverClient, CancellationToken cancellationToken)
[11.05.2026 12:17:27.310]          21 (1)      [Error]    at Veeam.Archiver.Integration.ArchiverConnector`2.CreateArchiverConnection(TE events, ICertificateValidator certificateValidator, IServiceConnectionConfig connectionConfig, Nullable`1 cancellationToken)
[11.05.2026 12:17:27.312]          21 (1)       [Info] Disconnecting from Veeam Backup for Microsoft 365 server...
[11.05.2026 12:17:27.322]          21 (1)      [Error] Error: Timeout has expired: 300000 milliseconds.
[11.05.2026 12:17:27.322]          21 (1)      [Error] Type: System.TimeoutException
[11.05.2026 12:17:27.322]          21 (1)      [Error] Stack:
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.ThrowHelper.ThrowOperationTimeout(Int32 timeoutMilliseconds, Exception innerError)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.MethodCall.ExecuteCallInternalAsync()
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.MethodCall.ExecuteCallAsync()
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.LoggingInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.MetricsInterceptor.MeasureAsync[T](Func`1 fn)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.MetricsInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.Vcf.Interceptors.TelemetryInterceptor.OnMethodCall(IMethodCall methodCall)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.InvokeAsync(InvokeArg invokeArg)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.<>c__DisplayClass8_0.<Invoke>b__0(Task _)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at System.Threading.Tasks.ContinuationResultTaskFromTask`1.InnerInvoke()
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
[11.05.2026 12:17:27.322]          21 (1)      [Error] --- End of stack trace from previous location ---
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
[11.05.2026 12:17:27.322]          21 (1)      [Error] --- End of stack trace from previous location ---
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.v4.Invoker.Invoke(InvokeArg invokeArg)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider.Invoke.InvokeProcessor.Invoke(InvokeArg invokeArg)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SPP.Communication.TypeProvider._RemoteProxy.Invoke_ReturnVoid_WithParameters(InvokeArg invokeArg, String methodName, Object[] parameters)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at VCF.RuntimeAssembly.Proxy.4336b073-f5ff-4285-a124-930290391478.InitiateRpcSession(Guid)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.Rpc.RpcServiceReconnectHandler`1.BeforeGetChannel(TService channel)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Engine.Communication.PrimitiveServiceClient`1.GetChannel(Boolean canReconnect)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SharePoint.Archiver.Remote.SharePointArchiverConnector.VerifyControllerVersion(IPrimitiveServiceClient`1 archiverClient, CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Archiver.Integration.ArchiverConnector`2.CreateArchiverConnection(TE events, ICertificateValidator certificateValidator, IServiceConnectionConfig connectionConfig, Nullable`1 cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SharePoint.Archiver.Remote.ArchiverSharePointClientCore.ConnectTo(IArchiverSharePointEvents events, IServiceConnectionConfig config, CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SharePoint.Archiver.Remote.ArchiverSharePointClient.ConnectTo(IArchiverSharePointEvents events, IServiceConnectionConfig config, CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.SharePoint.Explorer.Archiver.ServiceConnectionContext.Connect(IClientHandshakeEventPublisher clientHandshakeEventPublisher, CancellationToken token)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Presentation.Dialogs.ServiceConnectionDialog.ServiceConnectionViewModelFactory.<>c__DisplayClass0_0.<CreateViewModel>b__1(CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Presentation.Dialogs.ServiceConnectionDialog.Base.ServiceConnectionBaseViewModel.<CreateConnectionTask>b__46_0(CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Presentation.Tasks.AsyncConnectionTester.Run(CancellationToken cancellationToken)
[11.05.2026 12:17:27.322]          21 (1)      [Error]    at Veeam.Core.AsyncTask2.Execute()

i first noticed it through a serviceprovider connection, but it also doesn't open locally on the VBR/M365 Server itself!
i'll update casenumber as soon as i have one!

[raftbone]

Unfortunately I have to agree. We're facing the same issue.

[DaStivi]

ok, at least good to know it might not be a environment specific issue then when i'm not alone...

my Case #08089250

[Mildur]

Hi Stephan,

It still works for me locally on the Veeam Backup for Microsoft 365 server, both when opening it from the Start menu with connecting to the VBR/VB365 server and when launching it from within the VB365 backup console.
Thanks for sharing the case number. Let’s wait for feedback from our Support team.

@raftbone, please share your case number as well.

Thank you,
Fabian

[DaStivi]

i just double checked with launching from within vb365 console.. also runs into the timeout for me..
sharepoint and teams explorers are affected too!

exchange explorer works!

[Mildur]

I found similar cases (with v8.3) where restarting all Veeam and PostgreSQL services helped the customers in this cases.
But we never had the chance to investigate further, since the issue was resolved after the restart and we couldn't reproduce it.

Best,
Fabian

[DaStivi]

ok thx for that info, i might test this, but in theory i had restarted the backup server multiple times after 8.4 update because of other (windows) updates...

[raftbone]

In my case it indeed helped to restart all services.
Strange, since we anyway restarted all servers after upgrading to version 8.4.

[Mildur]

@DaStivi
Okay.

I have asked Support Management to compare this with the older cases.
If the same issue is confirmed, the case may be escalated to the R&D team for further investigation.

@raftbone
Thanks for confirming. If it happens again, please open a case with our support team.

Best,
Fabian

[DaStivi]

restart of services, didn't fixed it for me...

[Mildur]

Thanks for testing.

Our Support Management team has responded. They will compare the logs in your case with the other reports we received earlier this year.

Best,
Fabian

[DaStivi]

restarting looks like fixed it, but sadly the initial problem is backup now after 2 days... looks like at some point in time, the timeout on connecting is back!
working with support

[pesos]

any update?

[DaStivi]

I'm still investigating with the support and involving development now...

One thing we've already found, opening the OneDrive restore Explorer from "backup job level" it loads fast and also expanding the org is faster...

For a big customer with like 16 jobs you would expect this because only loading 16th of the users (eg 1000 users per job) is fast as this is "pre-filtered"

In reality, the time the loading and expanding is taking multiplied by 16 does not represent the same time when opening from the org Level!

Furthermore, even on sub 100Users tenants, with only one job, where in theory there shouldn't be a difference from org or job level , it makes a huge difference in loading times !

I've done some .net traces for the development, hopefully they find out what's going on!

One other thing I noticed, pSQL doing a. Lot of IOs while the restore explorer is loading!

[pesos]

I've tried restarting services/reopening dozens of times but can never get onedrive explorer to be functional.

[Mildur]

Hi,

Stephan’s case has now been escalated to QA.

@pesos
It would help us if you could open a support case and share your case number here.
You will also need a case if we have to provide a private fix for this issue.

Thank you,
Fabian