[horde] Latest Gmail app / Android update seems to break ActiveSync with Horde

[Volker Jordan]

Quoting Sebastian Arcus <s.arcus at open-t.co.uk>:

> Just a heads up that latest Android and/or Gmail app update seems to  
> break ActiveSync connection to Horde. I have reports so far of 4  
> phones of different brands - Samsung and Xiaomi - on Android 12 and  
> 16 respectively - which have all developed similar symptoms in the  
> last week or so. They are connected to 2 different Horde instances -  
> both on version 5.2.21. The emails and contacts endlessly reload  
> again and again. I have tried to clear the cache and storage for the  
> Gmail app. Also deleted and reconfigured the accounts on the phone.  
> The main error message I can find in the Horde logs is the one below  
> - which might or might not be connected to this:
>
> 2025-11-19T14:33:03+00:00 ERR: HORDE Returning HTTP 400 while  
> handling Find command. Error is: Find not supported. [pid 351 on  
> line 160 of "/srv/lighttpd/mail.mydomain.co.uk/horde/rpc.php"]
>
> Just wondering if anyone else has encountered this?
>
Hi Sebastian,

I am so glad that you wrote this. I already spend hours on this issue  
yesterday.
I enabled various debug options, but I never saw an error in the logs.
Blackberry, Outlook and iPhone still work without any issues.
I now switched to CardDav/CalDav/Imap until its working again. I think  
its an issue on Gmail.

Regards
Volker