Cannot access HTTPS web site if Web Proxy Filter is bound to HTTPS protocol

Source: Microsoft Support

RAPID PUBLISHING ARTICLES PROVIDE INFORMATION DIRECTLY FROM WITHIN THE MICROSOFT SUPPORT ORGANIZATION. THE INFORMATION CONTAINED HEREIN IS CREATED IN RESPONSE TO EMERGING OR UNIQUE TOPICS, OR IS INTENDED SUPPLEMENT OTHER KNOWLEDGE BASE INFORMATION.

Client cannot access HTTPS web site through ISA 2006.

If you check Network Monitor trace, you will find the ISA server side responds a HTTP 400 Bad Request to the client. This usually indicates SSL is attached with the Web Proxy filter.

Web proxy filter is bound to HTTPS protocol.

To verify whether this is the problem, please follow the steps below.

1. Go to Firewall Policy, on the right pane, click Toolbox tab, expand Protocols.

2. Right click HTTPs protocol, click Properties, verify if Web Proxy Filter is checked.

3. If Web Proxy Filter is checked, that can be the cause of the problem.

Detach web proxy filter from HTTPS protocol.

To do so, please follow the steps below:

1. Go to Firewall Policy, on the right pane, click Toolbox tab, expand Protocols.

2. Right click HTTPS protocol, click Properties, uncheck Web Proxy Filter.

By default, Web Proxy Filter only attached with HTTP protocol but not HTTPS protocol. If Web Proxy Filter is attached with HTTPS protocol, it will grasp the HTTPS traffic but cannot handle it correctly.

MICROSOFT CORPORATION AND/OR ITS RESPECTIVE SUPPLIERS MAKE NO REPRESENTATIONS ABOUT THE SUITABILITY, RELIABILITY, OR ACCURACY OF THE INFORMATION AND RELATED GRAPHICS CONTAINED HEREIN. ALL SUCH INFORMATION AND RELATED GRAPHICS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT AND/OR ITS RESPECTIVE SUPPLIERS HEREBY DISCLAIM ALL WARRANTIES AND CONDITIONS WITH REGARD TO THIS INFORMATION AND RELATED GRAPHICS, INCLUDING ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, WORKMANLIKE EFFORT, TITLE AND NON-INFRINGEMENT. YOU SPECIFICALLY AGREE THAT IN NO EVENT SHALL MICROSOFT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, INCIDENTAL, SPECIAL, CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF USE, DATA OR PROFITS, ARISING OUT OF OR IN ANY WAY CONNECTED WITH THE USE OF OR INABILITY TO USE THE INFORMATION AND RELATED GRAPHICS CONTAINED HEREIN, WHETHER BASED ON CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR OTHERWISE, EVEN IF MICROSOFT OR ANY OF ITS SUPPLIERS HAS BEEN ADVISED OF THE POSSIBILITY OF DAMAGES.