[GH-ISSUE #369] CalDavSynchronizer timing out with Yahoo! Calendar #353

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opened 2026-02-25 20:31:28 +03:00 by kerem · 0 comments

kerem commented

2026-02-25 20:31:28 +03:00

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Originally created by @DSC-Nick on GitHub (Oct 10, 2022).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/369

I have a law client that uses the plugin to sync their Outlook calendar with their Yahoo Business calendar. Two weeks ago, they were required to make app passwords for their email accounts. Since then, syncing has not worked correctly.

I've verified multiple times that the key is correct. It retrieves email no problem but when I try to sync the calendar, I get this:

CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '504' ('Connection Timed Out'). Message:
<HTML>
<HEAD>
<TITLE>Inactivity Timeout</TITLE>
</HEAD>

<BODY BGCOLOR="white" FGCOLOR="black">
<H1>Inactivity Timeout</H1>
<HR>

<FONT FACE="Helvetica,Arial"><B>
Description: Too much time has passed without sending any data for document.
</B></FONT>
<HR>
</BODY>

   at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<EnsureSuccessStatusCode>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(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.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequestAndReadResponse>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.DataAccess.CalDavDataAccess.<GetVersions>d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at CalDavSynchronizer.DataAccess.CalDavDataAccess.<GetVersions>d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.Implementation.CalDavRepository`1.<GetAllVersions>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GenSync.EntityRepositories.VersionAwareToStateAwareEntityRepositoryAdapter`4.<GetFullRepositoryState>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at GenSync.Synchronization.Synchronizer`11.<Synchronize>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GenSync.Synchronization.ContextCreatingSynchronizerDecorator`7.<Synchronize>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.Scheduling.SynchronizationProfileRunner.<RunAndRescheduleNoThrow>d__22.MoveNext()

Full raw output is located here

Here's what I've tried:

Changing the chunk size from 2-100
Disable perform in chunks.
Changed the date range. It'll work if the total number of days is like 7 or 8. (4-4, 6/1, etc)
Created a new Outlook profile.
Fresh installation of Win10 with nothing but Outlook and CalDavSynchronizer
Change DAV Connection Timeout in General settings to big numbers.

I've never really had to change much else to make things work and I'm not sure what's causing the time out. I've been working on this on and off for a few days and I'm running out of options. I wanted to see if others are having issues with Yahoo Calendars or if it's just me.

Originally created by @DSC-Nick on GitHub (Oct 10, 2022). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/369 I have a law client that uses the plugin to sync their Outlook calendar with their Yahoo Business calendar. Two weeks ago, they were required to make app passwords for their email accounts. Since then, syncing has not worked correctly. I've verified multiple times that the key is correct. It retrieves email no problem but when I try to sync the calendar, I get this: ``` CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '504' ('Connection Timed Out'). Message: <HTML> <HEAD> <TITLE>Inactivity Timeout</TITLE> </HEAD> <BODY BGCOLOR="white" FGCOLOR="black"> <H1>Inactivity Timeout</H1> <HR> <FONT FACE="Helvetica,Arial"><B> Description: Too much time has passed without sending any data for document. </B></FONT> <HR> </BODY> at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<EnsureSuccessStatusCode>d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(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.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequestAndReadResponse>d__7.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.DataAccess.CalDavDataAccess.<GetVersions>d__29.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at CalDavSynchronizer.DataAccess.CalDavDataAccess.<GetVersions>d__29.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.Implementation.CalDavRepository`1.<GetAllVersions>d__9.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at GenSync.EntityRepositories.VersionAwareToStateAwareEntityRepositoryAdapter`4.<GetFullRepositoryState>d__5.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) at GenSync.Synchronization.Synchronizer`11.<Synchronize>d__27.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at GenSync.Synchronization.ContextCreatingSynchronizerDecorator`7.<Synchronize>d__3.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.Scheduling.SynchronizationProfileRunner.<RunAndRescheduleNoThrow>d__22.MoveNext() ``` Full raw output is located [here](https://pastebin.com/sNs2RPta) Here's what I've tried: - Changing the chunk size from 2-100 - Disable perform in chunks. - Changed the date range. It'll work if the total number of days is like 7 or 8. (4-4, 6/1, etc) - Created a new Outlook profile. - Fresh installation of Win10 with nothing but Outlook and CalDavSynchronizer - Change DAV Connection Timeout in General settings to big numbers. I've never really had to change much else to make things work and I'm not sure what's causing the time out. I've been working on this on and off for a few days and I'm running out of options. I wanted to see if others are having issues with Yahoo Calendars or if it's just me.