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IP TFTP telephony not connecting to server?

Zophos Zop

Hey, i'm experiencing a problem with remote acces SSL VPN connection and IP tftp telephony not connecting on server. The connection goes through from cisco to UTM but it wont go through to the clients from UTM. Please advise on what the reason for this could be ?



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  • 0 in reply to BAlfson

    We check the logs and couldnt find anything related to the mentioned problem. Problem is when communication wont return to SSL VPN remote access Client - Open VPN (to Cisco IP communicator). When this IP communicator tries to connect with server, communication goes to the server and when going back from server to a client, it stops on UTM. Apparent problem is TFTP communication, we can only see this with TCPdump - we can't see anything from the logs. Because of this problem IP telephony won't establish a connection, because for succesfull connection it needs configuration file from TFTP server.

    We managed to establish communication only two times randomly but nothing was done/changed. After restarting communicator connection stopped working again.
    We already tried turning off every security settings (IPS, Web Protection, Advanced Threat Protection,...) and firewall rule was (any to any) allowed for SSL remote access tunnel to Server-Client. SSL VPN client has access to all local networks.

    We also have a couple of site-to-site VPN tunnels and in this case everything is working properly.

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  • 0 in reply to BAlfson

    We check the logs and couldnt find anything related to the mentioned problem. Problem is when communication wont return to SSL VPN remote access Client - Open VPN (to Cisco IP communicator). When this IP communicator tries to connect with server, communication goes to the server and when going back from server to a client, it stops on UTM. Apparent problem is TFTP communication, we can only see this with TCPdump - we can't see anything from the logs. Because of this problem IP telephony won't establish a connection, because for succesfull connection it needs configuration file from TFTP server.

    We managed to establish communication only two times randomly but nothing was done/changed. After restarting communicator connection stopped working again.
    We already tried turning off every security settings (IPS, Web Protection, Advanced Threat Protection,...) and firewall rule was (any to any) allowed for SSL remote access tunnel to Server-Client. SSL VPN client has access to all local networks.

    We also have a couple of site-to-site VPN tunnels and in this case everything is working properly.

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