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UC 500 problems using Terminal service or RDP through IIS server

I have a uc500 that is somehow blocking OUTGOING RDP traffic using IIS Web base Remote Administration. I've opened NAT ports TCP 8099 and SSL 8098 and lowered security level on the ports thus forwarding them to IIS servers IP! This parts works fine.I am able to connect and authenicate to the clients IIS Server via public IP add across the inet.All is good until I click maintenance on the Web server web site page and try to launch a remote desktop connection via the webserver!

error events =Description: list 106 denied tcp ->, 1 packet

Explanation: A packet matching the log criteria for the given access list was


Recommended Action: (LOG_STD_NO_ACTION);

Note ; I have no problems accessing this solution inside the LAN!

Everything works via the remote web connection EXECEPT for the Remote Desktop Connection under the mainteance tab! It seem as if the UC 500 is somehow blocking the outgoing mstsc.exe command! Can anyone please help!

Thank you kindly