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--- faq:faq_desktop_firewall_proxy [2026/06/09 17:00] – removed rob
+++ faq:faq_desktop_firewall_proxy [2026/06/09 18:46] (current) – [Recommended Exception Types] rob
@@ Line 1: / Line 1: @@
+====== Can I run the desktop behind a Firewall? ======
+We have the following IP address ranges:
+  * ''74.201.6.0 /24 (Mask: 255.255.255.0)''
+  * ''4.8.174.128 /25 (Mask: 255.255.255.128)''
+  * ''162.43.176.128 /27 (Mask: 255.255.255.224)''
+All application traffic uses port 443. The following domain names must also be permitted through your firewall:
+  * ''*.t4login.com''
+  * ''*.sim.t4login.com''
+  * ''https://futures-technologies.plus500.com/''
+==== Running Behind a Proxy Server ====
+The T4 Desktop application supports unauthenticated proxy servers. If your proxy requires authentication, you will need to configure T4 to bypass it, as the Microsoft .NET Framework does not support authenticated proxy servers.
+If your proxy does not require authentication, T4 should connect without any additional configuration. If connectivity issues persist, bypassing the proxy entirely is recommended if that option is available.
+Proxy configuration is supported via the following environment variable:
+<code>HTTPS_PROXY=http://proxy.example.com:8080</code>