HTTP 502 Error since update to Synology Calendar Version: 2.5.0-21145

[alexstrbonn]

Dear Sirs,
since the update to Synology Calendar Version: 2.5.0-21145
https://www.synology.com/de-de/releaseNote/Calendar
we constantly get a HTTP 502 error when using DAVx⁵ Version 4.3.16.1-ose.

Apparently some changes were implemented. Other clients (i.e. Thunderbird) still work well.
A new installation of DAVx did not solve the issue. Also an installation of a previous DAVx version (i.e.4.3.15) did not solve the issue.

Therefore it is likely synology has implemented some changes leading to this error.
Is there any solution you would know of?

Many thanks!

[devvv4ever]

Hello,

this seems to be a bug introduced with the latest updates on Synology. Please have a look here where it is already reported: https://community.synology.com/enu/forum/1/post/187744

Hope they can identify the cause of this and offer an update soon!

[devvv4ever]

We've investigated a bit more:

This error does not seem to be directly related to any VEVENT itself, but to an internal warning text from Synology that is put before the actual parsing code of the VEVENT. So the XML parser wants to start but there is no XML code to parse, instead it is a warning text before the XML. Thus it crashes.

You can also try to somehow disable warning messages on Synology. Then it would not inject additional text before the actual XML and it should start working again.

You could as an admin enable SSH for Synology in the DSM settings under "Terminal & SMNP" and then connect to it on a console. then disable it directly in

/etc/php/php.ini

and on line at the end add &~E_WARNING like:

error_reporting = <keep rest here and add:> &~E_WARNING

Can you try that? If that removes the error we have some proof that we can report to Synology.

[Vincenzo-Puzone]

I've tried the suggested fix but it doesn't work

[devvv4ever]

It seems to be already being investigated by Synology as you can read here in the posting from May 8th: https://community.synology.com/enu/forum/1/post/187819

[piere07]

Hi all,

I also made a test.
The question was: which "php.ini" file do I have to modify since I identified 3 "php.ini" files on my NAS (DS918+):

• /usr/local/etc/php82/cli/php.ini
• /etc/php/php.ini
• /volume1/@appstore/Calendar/conf/phpini.d/calendar-php.ini

After I modified "/volume1/@appstore/Calendar/conf/phpini.d/calendar-php.ini" this way:

19c19
< error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT & ~E_NOTICE
---
> error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT & ~E_NOTICE & ~E_WARNING

I am able to synchronize the calendar between a mobile device and the NAS.

Have a nice day, Pierre.

[manne01]

Tried the same change in the same file. Also restarted Packages PHP 8.1, Calendar Package and Webstation Package... But I still got 502.

But there is a Version 2.5.1-21153 available now - fixes the issue! (And also reverts the above change)

[piere07]

Hello Manne01,

I am sorry, but my answer was not about this 502 error. I made a mistake posting the solution in this thread.
My problem was "Erreur de serveur HTTP - Couldn't parse multistatus XML element".
And, yes, the new release provides a new "calendar-php.ini" file and thus replace the corrected one.

Have a nice day and best regards, Pierre.