A user has reported application connectivity problems to the network administrator. The network administrator knows there have been firewall configuration changes recently by a security vendor and believes the issue could be related to a port being closed on the firewall. Which of the following should the network administrator do NEXT?
A. See if the same application fails on another workstation
B. Go into the firewall and open the port
C. Verify system functionality on the user’s workstation
D. Document the issue for future reference