We have an Mac on our network which connects into our SBS 2008 server to get email through Exchange 2007 (SP2). Just recently this Mac has been logging up thousands of failed login attempts throughout the day when the user at the machine is working.
Each time the failed login attempt generates security event 4625 on the server but the user is able to send and receive without any issues so we know it is not a password issue. We have also checked the IIS log files and below is an example of what is logged nearly every minute:
2011-07-29 00:06:16 192.168.1.100 POST /EWS/Exchange.asmx - 443 - 192.168.1.43 Mac+OS+X/10.6.8+(10K540);+ExchangeWebServices/1.3+(61);+Mail/4.5+(1084) 401 2 5 1
Can anyone think what would be causing this and how we can fix it ?
