A. This is not advisable, you should define filters for all the traffic you wish to allow however if you want to try something quickly you can just disable the filter as follows:

  1. Start the ISA Admin tool (Start - Programs - Microsoft ISA Server - ISA Administration Tool)
  2. Expand the Arrays, the specific array, Access Policy
  3. Right click IP Packet Filters
  4. Select Properties
  5. Unselect 'Enable packet filtering'
  6. Click OK

To enable again perform the above but in step 5 you would select rather than unselect.