What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E? (Choose two.)
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A. B. C. D. E.DE.
Port 8443 is used by the Expressway-E to receive HTTPS traffic from the internet, which is required for various services such as Mobile Remote Access (MRA) and Jabber Guest. If this port is unreachable from the internet, it can be due to several reasons:
A. The MRA license is missing on the Expressway-E: MRA requires a specific license to be installed and activated on the Expressway-E. Without the MRA license, the Expressway-E will not be able to communicate with external clients over the internet, and port 8443 will be inaccessible.
B. The Unified Communications zone is down: If the Unified Communications zone, which is responsible for routing traffic between the Expressway-E and other Unified Communications systems, is down, then port 8443 may become unreachable from the internet. This could be due to misconfigurations or connectivity issues with other Unified Communications systems.
C. Transform is not configured on Expressway: Transforms are used to manipulate SIP headers and message bodies to allow for proper communication between different Unified Communications systems. If transforms are not properly configured on the Expressway-E, then port 8443 may become unreachable from the internet, as the Expressway-E may not be able to properly process incoming HTTPS traffic.
D. The SRV record for _cisco-uds is misconfigured: The SRV record for _cisco-uds is used by clients to locate the Expressway-E when attempting to connect to Unified Communications services over the internet. If this record is misconfigured, clients may not be able to locate the Expressway-E, resulting in port 8443 becoming unreachable from the internet.
E. The firewall is blocking the port: Firewalls are used to restrict incoming and outgoing network traffic based on specific rules. If the firewall is configured to block incoming traffic on port 8443, then the port will be unreachable from the internet.
It is important to note that there could be other reasons why port 8443 is unreachable from the internet to the Expressway-E, but the above mentioned are some of the most common reasons. Troubleshooting the issue would require identifying the cause and addressing it accordingly.