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lodewijk

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I seem to have discovered some strangeness at a few of our clients Kerio installations.

Kerio 7.3 patch1
iCal 10.6.8

I have setup iCal using the Auto Configuration downloaded under the settings menu in the users webmail account.

Every time iCal is launched 2 invalid password errors get generated to the security log.

LDAP: Invalid password for user xxx<_at_>xxx.nl. Attempt from IP address 10.0.10.129.


iCal gives no errors what so ever and seems a very happy bunny and everything works as expected. If the "sync all calendars" thing in iCal is done, no errors seem to be posted to the Kerio security log, so ONLY when iCal is launched do the invalid password errors appear...

So everything works anyway, so why bother, right?

Except (and this is how I found out about it in the first place) when you enable the settings for password guessing protection that temporary locks-out accounts, this will make Mail and Addressbook go offline completely for 5 minutes!

So turned those extra security options off again...
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mattc

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We are seeing a similar issue here with users using Outlook 2011 or iCal/Mail.

If we have "Block user accounts based on password guessing" option enabled users using Outlook 2011 will randomly be blocked.

We see log entries as below:

HTTP/EWS: Invalid password for user xxxxx
or
HTTP/WebDAV: Invalid password for user
and then
Attempt to LDAP login to locked account xxxxx

Server:
Centos 6 using OD Kerberos authentication
Kerio Connect 7.3.1 patch 2 build 6199

Clients:
Mac OSX 10.6.8
Outlook 2011
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Kcaldera

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I am also seeing this error in my security logs.

Using:
Mac Mini OS X 10.6.8
Kerio 7.3.1 p2 build 6199

Clients:
Entourage 2008
Entourage 2008 WSE

This error seems to only be generated by Entourage, not OS X Mail or Ical.

HTTP/EWS: Invalid password from user xxxx<_at_>xxxx. Attempt from IP address xxxxx
HTTP/WebDAV: Invalid password for user xxx<_at_>xxxx. Attempt from IP address xxxxx
HTTP/ActiveSync: Invalid password for user xxx<_at_>xxx. Attempt from IP address xxxx

I believe this is caused by having the "NTLM Authentication" setting active. I have turned it off for testing purposes.

Kerio Admin -> Advanced Options -> Security Policy -> (Allow NTLM Authentication for users with Kerberos)
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