Traffic incorrectly going to ISA Server 2006 instead of going directly to the server

Introduction   This post is about an interesting issue where a third party application that was configured as service was failing to establish a connection with the destination server because ISA Server was denying the traffic. For this brief description it really sounds like a trivial issue where you just need to create an access…


Identifying the Source of the Traffic

Couple of days ago I was assisting a friend to troubleshoot the infamous 5783 that was causing the authentication prompt issue that we all know about. In this case the problem was happening throughout the night, which was even odder because during the day when the traffic was really high the issue wasn’t happen. The…


Another fun with Change Password feature through ISA Server 2006

1. Introduction   When we think that we had covered all scenarios to mitigate possible issues with change password feature through ISA Server 2006 something new happen. This quick post is about a scenario where only users that belong to a specific OU were unable to change password through ISA Server 2006. The users that…


Firewall Client Error when Browsing a Web Site

Last week I was working on a very interesting case where only one specific user was having a problem browsing Internet through ISA Server 2006. When this specific user was trying to access Internet he receives a page with a time out error message and Firewall client turns red immediately. Interesting part was that regardless…


Unable to Logon Using Forms Base Authentication through ISA Server 2006

1. Introduction   Consider a scenario where external client is trying to authenticate in an OWA publishing rule through ISA Server 2006 using Forms Base Authentication. In this scenario ISA Server 2006 was in workgroup and the FBA was using LDAPS authentication method. Problem: authentication doesn’t go through; it keeps in the same FBA window…


Error 58 “The specified server cannot perform the requested operation” while while performing LDAP authentication through ISA Server 2006

1. Introduction   This post is about a scenario where users were not able to authenticate on a FBA page published by ISA Server using LDAP as authentication repository. The error message that was showing up there was:   Figure 1 – Unable to authenticate.   Although it says to double check the domain name…


Multiple Authentications Prompt while Accessing a Web Site Published through ISA Server 2006

1. Introduction   This post is about an interesting case where customer was publishing a web site through ISA Server 2006 and he wants to receive an authentication prompt when users access the web site rather than show the Forms Base Authentication page. No problem on that, but the issue was that when the external…