[isapros] how to set port 80 not go above 200 milliseconds

Hi 
 
Please shed light on the following:
 
I have a client behind ISA Server trying to establish connection to business 
online banking. The message comes up saying "Error occured while communicating 
to server. Header error [-1 null]". 
 
I have called the bank in question and was advised to change the settings on 
Port 443 and 80 must be increased and set to not go above 200 milliseconds.
 
I am not being advised where exactly to make these changes 
 
Please help...


      

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