McDewey

Cisco Secure Telnet Cisco Secure Telnet offers Cisco Service Engineers (CSE) transparent firewall access to Unified Communications Manager servers on your site. Cisco Secure Telnet works by enabling a Telnet client inside the Cisco Systems firewall to connect to a Telnet daemon behind your firewall. This secure connection allows remote monitoring and maintenance of your Unified Communications Manager servers without requiring firewall modifications. Cisco accesses your network only with your permission. You must provide a network administrator at your site to help initiate the process. Note Firewall Protection Virtually all internal networks use firewall applications to restrict outside access to internal host systems. These applications protect your network by restricting IP connections between the network and the public Internet. Firewalls work by automatically blocking TCP/IP connections that are initiated from the outside, unless the software is reconfigured to allow such access. Corporate networks normally permit communication with the public Internet but only if connections directed to outside hosts originate from inside the firewall. Cisco Secure Telnet Design Cisco Secure Telnet takes advantage of the fact that Telnet connections can easily be initiated from behind a firewall. Using an external proxy machine, the system relays TCP/IP communications from behind your firewall to a host behind another firewall at the Cisco Technical Assistance Center (TAC). Using this relay server maintains the integrity of both firewalls while secure communication between the shielded remote systems get supported. Figure 1: Cisco Secure Telnet System Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 302 Troubleshooting Cisco Secure Telnet