[horde] Active sync ping error

[Ruud Baart]

Horde 6, Debian trixie, php 8.4, nginx 1.26

There is an error that I just can't seem to resolve. As far as I can 
see, the ActiveSync clients are working fine. In the log files, I see 
that only the ActiveSync ping (Cmd=Ping) commands are not working. I 
don't really understand what is going wrong. The sync (Cmd=Sync) 
commands are working fine. Perhaps it is a configuration error, but I 
don't know what I should change. I also don't know what the consequences 
of this error are.

I don't think it is a rewrite problem in the nginx configuration. Also, 
I don't expect the time out error

     (110: Connection timed out) while reading response header from 
upstream ....

is due to server side problems because this is the only site and only 
message of this type on the server.  It seems strange to me that the 
time out is coming very fast, even before nginx logs the rewrite.

Perhaps I did something wrong in horde conf.php:

$conf['activesync']['ping']['heartbeatmin'] = 60;
$conf['activesync']['ping']['heartbeatmax'] = 2700;
$conf['activesync']['ping']['heartbeatdefault'] = 480;
$conf['activesync']['ping']['deviceping'] = true;
$conf['activesync']['ping']['waitinterval'] = 15;
$conf['activesync']['ping']['maximumwindowsize'] = 0;
$conf['activesync']['ping']['maximumrequestwindowsize'] = 0;

The error and the rewrite log from nginx:

2026/02/18 13:59:56 [error] 1217449#1217449: *158695 upstream timed out 
(110: Connection timed out) while reading response header from upstream, 
client: 37.66.52.174, server: abc.def.fr, request: "POST 
/Microsoft-Server-ActiveSync?Cmd=Ping&User=name%40def.fr&DeviceId=androidc588464893&DeviceType=Android 
HTTP/1.1", upstream: "fastcgi://unix:/run/php/php8.4-fpm.sock", host: 
"abc.def.fr"

2026/02/18 13:59:57 [notice] 1217449#1217449: *158695 rewritten data: 
"/horde/rpc.php", args: 
"Cmd=Ping&User=name%40def.fr&DeviceId=androidc588464893&DeviceType=Android", 
client: 37.66.52.174, server: abc.def.fr, request: "POST 
/Microsoft-Server-ActiveSync?Cmd=Ping&User=name%40def.fr&DeviceId=androidc588464893&DeviceType=Android 
HTTP/1.1", host: "abc.def.fr"

in php8.4-fpm.log no errors or warnings

-- 

Cordialement,

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R.J. Baart
Portable: +33 7 88398245

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