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Technical Information

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Technical Information about
  Citrix Filter
  DNS from Internal Network to an External ISP’s DNS Servers
  POP3 from Internal Network to an External ISP’s Mail Servers
  SMTP from Internal Network to an External ISP’s Mail Servers

Technical Information
 Citrix Filter

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These filter exceptions will allow the Citrix ICA client traffic and the Citrix browser-based client traffic out of the BorderManager firewall. Because Citrix has used two different client technologies, one a stand-alone based client (ICA) and the other a snap-in component of a web browser, different filter exceptions may be required.

Figure 1 - FILTCFG - Citrix Filter Exception for TCP Port 1494



This filter exception allows the stand-alone ICA client to communicate with a remote Citrix WinFrame / MetaFrame host outside the BorderManager firewall. This stateful filter exception allows protocol TCP, source ports 1024-65535, destination port 1494 to any IP address. The filter exception is applied with a Source Interface of the BorderManager private interface, and a Destination Interface of the BorderManager public interface.

Figure 2 - FILTCFG - Citrix Filter Exception for TCP port 1604



This filter exception allows the browser-based (and later versions of the stand-alone ICA) client to communicate with a remote Citrix WinFrame / MetaFrame host outside the BorderManager firewall. This stateful filter exception allows protocol TCP, source ports 1024-65535, destination port 1604 to any IP address. The filter exception is applied with a Source Interface of the BorderManager private interface, and a Destination Interface of the BorderManager public interface.






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