[GH-ISSUE #460] Synchronization error #445

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opened 2026-02-25 20:31:40 +03:00 by kerem · 0 comments

kerem commented

2026-02-25 20:31:40 +03:00

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Originally created by @stpalan on GitHub (Nov 12, 2025).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/460

Since this morning, every 10 minutes (my regular sync interval) I get the following error:

CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '400' ('Bad Request'). Message:

<D:error xmlns:D="DAV:"/>

at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CalDavSynchronizer.DataAccess.CalDavDataAccess.d__28.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CalDavSynchronizer.Implementation.CalDavRepository1.<TryUpdate>d__16.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at CalDavSynchronizer.Implementation.CalDavRepository1.d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.d__3.MoveNext()

When I create a new appointment or delete an appointment in my calendar, then the synchronization works without problem once and then again resumes giving me the error. Can you help me figure out what the problem is? If it helps, the profile (one way) mirrors an exchange calendar to a Google calendar.

Originally created by @stpalan on GitHub (Nov 12, 2025). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/460 Since this morning, every 10 minutes (my regular sync interval) I get the following error: > CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '400' ('Bad Request'). Message: > <?xml version="1.0" encoding="UTF-8"?> > <D:error xmlns:D="DAV:"/> > > at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<EnsureSuccessStatusCode>d__10.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) > at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequest>d__9.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) > at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequestAndReturnResponseHeaders>d__8.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) > at CalDavSynchronizer.DataAccess.CalDavDataAccess.<TryUpdateEntity>d__28.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) > at CalDavSynchronizer.Implementation.CalDavRepository`1.<TryUpdate>d__16.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at CalDavSynchronizer.Implementation.CalDavRepository`1.<TryUpdate>d__16.MoveNext() > --- End of stack trace from previous location where exception was thrown --- > at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() > at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.<PerformOperations>d__3.MoveNext() When I create a new appointment or delete an appointment in my calendar, then the synchronization works without problem once and then again resumes giving me the error. Can you help me figure out what the problem is? If it helps, the profile (one way) mirrors an exchange calendar to a Google calendar.