I am new to this list so I apologise up front if I am using it incorrectly.

I have developed a small application for clients to download files from the 
internet using tHttpCli. Generally it works OK without software firewalls 
blocking the communication however, every now and then, some software firewalls 
(eg Vet, Nortons, Mcafee, AVG, TrendMicro, Zone Alarm, etc.) will suddenly 
block the communication with no message or warning (generally after they have 
done an update). The client then needs to put in (or refresh) an exception into 
their software firewall/antivirus and everything is OK.

The program first downloads files from a non password protected section of the 
server then downloads additional files from a password protected section of the 
server (not a https server). It is interesting to note that the firewalls only 
have a problem with the password protected section.

I am guessing that when tHttpCli and the server are authenticating usernames & 
passwords it is not done on the usual Http port and hence the firewalls see 
this and block the communication.

If this is true, is there some way to "force" tHttpCli to use the same port for 
username and password authentication, much like passive mode does for FTP?

If this is not true, do you have any suggestions for what might be causing the 
problem and/or how to fix it.

PS I think I am using a fairly old version of ICS.


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