This is interesting (and annoying) issue, which has been going on for a few months with no understanding on why it is happening.
From my research, the IIS logs on Windows Server 2008 R2 which also hosts Exchange 2010 has grown to around 40MB each day, luckly there is ample space on the system drive to copy with this.
The WinHTTP Web Proxy Auto-Discovery Service service starts every 1 hour and 7 minutes.
3 seconds later after starting the following is recorded in IIS logs:
2014-03-03 08:21:39 ipaddress POST /Autodiscover/Autodiscover.xml - 443 - ipaddress - 401 0 0 0
2014-03-03 08:21:39 ipaddress POST /Autodiscover/Autodiscover.xml - 443 - ipaddress - 401 1 2148074254 0
2014-03-03 08:21:39 ipaddress POST /Autodiscover/Autodiscover.xml - 443 DOMAIN\SERVERNAME$ ipaddress - 200 0 0 31
[ ipaddress, is the local ip address of the server ]
Followed by the same three lines 2483 times in 2 minutes.
2014-03-03 08:21:41 ipaddress POST /EWS/Exchange.asmx - 443 - ipaddress Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+2.0.50727.5472) 401 0 0 0
2014-03-03 08:21:41 ipaddress POST /EWS/Exchange.asmx - 443 - ipaddress Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+2.0.50727.5472) 401 1 2148074254 0
2014-03-03 08:21:41 ipaddress POST /EWS/Exchange.asmx - 443 DOMAIN\SERVERNAME$ ipaddress Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+2.0.50727.5472) 200 0 0 889
Why is the WinHTTP Web Proxy Auto-Discovery Service trying to hammer our Exchange Server every 1 hour 7 minutes.
We have no proxy server (see below) and our Exchange Server is 2010 SP3 with Update Rollup 2.
C:\>netsh winhttp show proxy
Current WinHTTP proxy settings:
Direct access (no proxy server).
Any advice on stopping the WinHTTP Web Proxy increasing the IIS Logs would be appreciated.
Kind Regards
fossehs