Allow SSL on port 80

Hello,
our TMG is blocking SSL over port 80:

Failed Connection Attempt 
Log type: Web Proxy (Forward) 
Status: 12204 The specified Secure Sockets Layer (SSL) port is not allowed. Forefront TMG is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests.  
Source: Internal (<ClientIPAddress>:63346) 
Destination: <InternalTMGIPAddress>:80 
Request: <ExternalIPAddress>:80 
Filter information: Req ID: 09eb22aa; Compression: client=No, server=No, compress rate=0% decompress rate=0% 
Protocol: SSL-tunnel 

As I understand by message above the application is trying to connect to port 80 via SSL; isn't it ? As I know, I should enable not-standard SSL on TMG by launching this script:

Const NewRangeName = "SSL 80"
Const NewRangePort = "80"

Dim root 
Dim tpRanges 
Dim newRange 

Set root = CreateObject("FPC.Root")
Set tpRanges = root.GetContainingArray.ArrayPolicy.WebProxy.TunnelPortRanges
set newRange = tpRanges.AddRange(NewRangeName, NewRangePort, NewRangePort)
tpRanges.Save

The question is: could I add port 80 (normally used for HTTP) ? Or does it cause some problem on TMG ?

Thank you,
Luca

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