Refer to the exhibit.
The snippet is part of a PRT log from a Jabber for Windows user who is unable to login via Mobile and Remote Access (MRA). Which is the root cause of this issue?
A. _collab-edge._tls.vceguide.com DNS SRV record is not created in the external DNS server
B. The Expressway-E certificate is self-signed
C. The Expressway-E is not reachable on port 8443 due to firewall or network connectivity issue
D. The Expressway-E is reachable on port 8443 but it rejects the connection due to client-side certificate issue
E. The user is trying to login from Internal company network
C
If the Jabber client is started and does not receive an SRV answer for _cisco-uds and _cuplogin and does receive an answer for _collab-edge, then it uses this answer to try to contact the Expressway-E listed in the SRV answer.
The _collab-edge SRV record should point to the Fully Qualified Domain Name (FQDN) of Expressway-E with port 8443. If the _collab-edge SRV is not created, or is not externally available, or if it is available, but port 8443 is not reachable, then the Jabber client fails to log in.
the Jabber client sent the first https request to Exp-E ==> he got already the right FQDN
I think the correct answer is : C since the connection timed out