[horde] ActiveSync Client(s) overload server

[Michael J Rubinsky]

Quoting Steffen <skhorde at smail.inf.fh-bonn-rhein-sieg.de>:

> Hi,
>
> last days the partition of the SQLDB of Horde run full, I cleared  
> the problem and restarted the server. Since then ActiveSync clients  
> have problems to sync.
>
> Five clients open more and more connections running with 100% CPU  
> each, so that within half an hour the load of the server increases  
> so high, that it is infact a denial-of-service. I have blocked them  
> now.
>
> Is there a way to limit active connections per client within Horde?  
> If I limit the access to the GUI on the firewall, people find the  
> GUI unusable.
>
> ====
>
> Other clients cannot sync as well, but do not consume noticable CPU  
> time in that way.
>
> Before I ask about the sync problem itself, I'll update the Horde  
> installation to the latest PEAR packages, maybe something was fixed.
> However, to have several ActiveSync clients take the server down is  
> troublesome.


Hard to say without seeing logs. However, it sounds like you might  
have removed some of the state data and/or history data from the  
database. If that's the case, what's happening is every client must  
re-provision with the server again - essentially resetting the client  
account. Besides this being very resource intensive on the server,  
some older clients are buggy in the way they handle loss of state.


> Kind regards,
>
> -- 
> Steffen
> -- 
> Horde mailing list
> Frequently Asked Questions: http://horde.org/faq/
> To unsubscribe, mail: horde-unsubscribe at lists.horde.org



-- 
mike
The Horde Project
http://www.horde.org
https://www.facebook.com/hordeproject
https://www.twitter.com/hordeproject
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-keys
Size: 9272 bytes
Desc: PGP Public Key
URL: <https://lists.horde.org/archives/horde/attachments/20170708/d189021a/attachment-0002.bin>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 821 bytes
Desc: PGP Digital Signature
URL: <https://lists.horde.org/archives/horde/attachments/20170708/d189021a/attachment-0003.bin>