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Appendix A. TCP Ports Used by ThinLinc
300: ThinLinc HTML5 Browser Client
By default, ThinLinc’s HTML5 Browser client service tlwebaccess is available on TCP port 300.
Traffic to this port is encrypted (TLS).
Note: The port on which tlwebaccess runs is configurable via the parameter
/webaccess/listen_port. See Section 8.7.3.1.1 for details.
904: VSM Agent
The VSM agent listens on port 904 for incoming requests from the VSM server host. The traffic is
not encrypted, but the VSM agent only allows connections originating from a port lower than 1024,
from a list of known IP adresses. The protocol in use is XMLRPC through HTTP.
1010: ThinLinc Administration Interface (tlwebadm)
By default, ThinLinc’s web-based administration interface is available on TCP port 1010. See the
entry about port 1010 at Section A.1.
5901-5999: VNC servers for first 99 sessions
Ports 5901-5999 are used by Xvnc processes serving display numbers strictly below 100.
4900-5899: Tunnels from Terminal Server to clients
The ports in this interval is used as serverside endpoints for the SSH tunnels used to access local
resources of the client, for example local drives, serial ports and sound.
This interval is used for sessions with display number strictly below 100.
The algorithm used for calulating which ports to use for a specific display number in this interval is
4900 + display-id*10 + SERVICE_SLOT where SERVICE_SLOT is a number defined under
/vsm/tunnelservices.
6001-8000: X Display ports
If Xvnc is configured to listen for incoming TCP requests from X Window System clients on other
hosts, ports 6001-8000 are used by display numbers 1-2000. The default is not to listen for
incoming TCP requests, so in the default configuration, the ports in this interval are not open.
Port 32767 downwards to 11857
The algorithm described below is used to allocate ports for the Xvnc process and for the serverside
endpoints for SSH tunnels to access local resources of the client. This algorithm is used for sessions
with display numbers strictly higher than 99.
Each session is allocated /vsm/tunnelslots_per_session (default value 10) + 1 ports, leading
to an allocation of 11 ports per session with the default configuration. The ports are allocated
starting with the port given as /vsmagent/max_session_port (default 32767), and then
downwards. This means that the ports are aligned upwards as closely as possible to the upper limit
defined. This is a good practice to avoid collisions with other services running on the machine.
Some examples follow
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