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MAC OS X/10.10 - DoS

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MAC OS X/10.10 - DoS - 4.Nov.2014 9:40:57 AM   


Posts: 2
Joined: 4.Nov.2014
Status: offline
Recently we have been experiencing performance-issues on our client-access servers (Exchange2007 SP3) caused by devices running MAC OS X / 10.10. A number of them (between 10 and 15) are occasionally sending many thousands of these posts:

POST /autodiscover/autodiscover.xml

The device-info shown in the IIS-logs is: Mac+OS+X/10.10+(14A389);+ExchangeWebServices/5.0+(213);+Mail/8.0+(1990.1)

We're talking about up to 300.000 posts per device in an hour or two; this causes a tremendous growth of our logfiles and is causing performance-issues on our client-access-servers. Has anyone else experienced this, and if so, what is the cause and what would be a good resolution?
Post #: 1
RE: MAC OS X/10.10 - DoS - 5.Nov.2014 10:49:15 AM   


Posts: 80
Joined: 23.May2005
Status: offline
It seems something with auto discovery does not work properly on your clients.
How is communication between MacOS and exchange occuring?
Have you tried switching to IMAP?

(in reply to jpjms)
Post #: 2
RE: MAC OS X/10.10 - DoS - 6.Nov.2014 7:59:42 AM   


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Joined: 4.Nov.2014
Status: offline
Switching to IMAP is a solution, although the configuration of IMAP in a client is not as userfriendly as the configuration of activesync. Not all mac-os devices have this issue. The similarity however between all devices that cause these problems is that they are running Mac OS X/10.10. I haven't seen any other devices that cause these problems (I work at a large educational institution with (15.000 + students and 4000+ employees) with a bring-your-own-device policy, so you can imagine you see all sorts of devices connecting to our exchange-environment.

(in reply to Admin)
Post #: 3

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