[GH-ISSUE #449] Synchronization error Outlook 365 and Nextcloud #1299

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opened 2026-03-14 00:56:50 +03:00 by kerem · 1 comment

kerem commented

2026-03-14 00:56:50 +03:00

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Originally created by @Wildvirus on GitHub (Mar 8, 2025).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/449

Since some days there are sync error messages

<ExceptionThatLeadToAbortion>CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '401' ('Unauthorized'). Message:
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns"&gt;
	&lt;s:exception&gt;Internal Server Error&lt;/s:exception&gt;
	&lt;s:message&gt;
		The server was unable to complete your request.		If this happens again, please send the technical details below to the server administrator.		More details can be found in the server log.			&lt;/s:message&gt;

	&lt;s:technical-details&gt;
		&lt;s:remote-address&gt;2003:fb:8f4a:4c00:c41b:87ee:c1a5:3c3c&lt;/s:remote-address&gt;
		&lt;s:request-id&gt;Z8zCwRomCe5fadDJuYFDdgAABSY&lt;/s:request-id&gt;

		&lt;/s:technical-details&gt;
&lt;/d:error&gt;

  bei 
CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.&lt;EnsureSuccessStatusCode&gt;d__10.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.&lt;ExecuteWebDavRequest&gt;d__9.MoveNext().......</ExceptionThatLeadToAbortion>
  <ConsiderExceptionThatLeadToAbortionAsWarning>false</ConsiderExceptionThatLeadToAbortionAsWarning>

Occurs when synchronizing both contacts and the calendar.
The saved URL is correct; when opened in the browser, it is displayed that this is a WebDAV URL.

Installed is CalDav Synchronizer 4.5.0.0
Nextcloud Hub 9 30.0.6

In the server log are no error messages

Originally created by @Wildvirus on GitHub (Mar 8, 2025). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/449 Since some days there are sync error messages ```` <ExceptionThatLeadToAbortion>CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '401' ('Unauthorized'). Message: <?xml version="1.0" encoding="utf-8"?> <d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns"> <s:exception>Internal Server Error</s:exception> <s:message> The server was unable to complete your request. If this happens again, please send the technical details below to the server administrator. More details can be found in the server log. </s:message> <s:technical-details> <s:remote-address>2003:fb:8f4a:4c00:c41b:87ee:c1a5:3c3c</s:remote-address> <s:request-id>Z8zCwRomCe5fadDJuYFDdgAABSY</s:request-id> </s:technical-details> </d:error> bei CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<EnsureSuccessStatusCode>d__10.MoveNext() --- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde --- bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) bei CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequest>d__9.MoveNext().......</ExceptionThatLeadToAbortion> <ConsiderExceptionThatLeadToAbortionAsWarning>false</ConsiderExceptionThatLeadToAbortionAsWarning> ```` Occurs when synchronizing both contacts and the calendar. The saved URL is correct; when opened in the browser, it is displayed that this is a WebDAV URL. Installed is CalDav Synchronizer 4.5.0.0 Nextcloud Hub 9 30.0.6 In the server log are no error messages

kerem closed this issue

2026-03-14 00:56:56 +03:00

kerem commented

2026-03-14 00:57:02 +03:00

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@Wildvirus commented on GitHub (Mar 8, 2025):

Found the error that the app password (2FA is enabled) was deleted. New defined and now sync is running again.

@Wildvirus commented on GitHub (Mar 8, 2025): Found the error that the app password (2FA is enabled) was deleted. New defined and now sync is running again.