Unidentified TCP Traffic

I'm trying to publish a Web Application on port 81 on ISA Server using a Publishing Rule that redirect to an internal server on port 80, but when i trying to browse website, it failed to browse and return this error:
HTTP Error 403.4 - Forbidden: SSL is required to view this resource.
Internet Information Services (IIS)

ISA Error:
********************
Initiated Connection DUMBLEDORE 10/15/2008 1:16:33 PM
Log type: Firewall service
Status:  
Rule:  
Source: External (x.x.x.x:1658)
Destination: Local Host (x.x.x.x:81)
Protocol: Unidentified TCP Traffic
User:  
 Additional information
Number of bytes sent: 0 Number of bytes received: 0
Processing time: 0 ms Original Client IP: x.x.x.x
Client agent:
 ************************
Allowed Connection DUMBLEDORE 10/15/2008 1:16:33 PM
Log type: Web Proxy (Reverse)
Status: 403 Forbidden
Rule: Publish office.xxx.net
Source: External (x.x.x.x)
Destination: (192.168.10.5:80)
Request: GET http://td.xxx.net/ 
Filter information: Req ID: 0fa941c9; Compression: client=Yes, server=No, compress rate=43% decompress rate=0%
Protocol: http
User: anonymous
 Additional information
Client agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
Object source: Internet (Source is the Internet. Object was added to the cache.)
Cache info: 0x60000000 (Response includes the TRANSFER-ENCODING header. Response should not be cached.)
Processing time: 1 ms
MIME type:  
*************************

I'm not using SSL on publishin this website.
chargoonAsked:
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chargoonConnect With a Mentor Author Commented:
After installing ISA Server 2006 Service Pack 1, the problem solved!
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Dusan_BajicCommented:
When you access web site from internal network, is everything working fine?
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chargoonAuthor Commented:
Yes, because internal network and web server are in same range.

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Dusan_BajicCommented:
I would check settings on IIS, looks like problem is not with ISA (I am not sure of course)
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