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How Does TS Agent for Citrix Terminal Server Identify User Logi... - Knowledge Base - Palo Alto Networks

How Does TS Agent for Citrix Terminal Server Identify User Login Events?

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Created On 03/30/19 02:40 AM - Last Modified 03/05/25 10:04 AM


Question


How does the Terminal Server (TS) agent for Citrix Terminal Server identify user login events?

Environment


  • NGFW
  • Terminal Server Agent


Answer


When a user logs into Citrix Terminal Server, the TS agent gets notified through the windows API.
The TS agent puts this new login event into a queue and processes allocating port ranges.
Then it pushes the logged in User-ID down to the TS agent kernel driver where sessions are intercepted and the source port is altered.



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