- Access to the firewall itself is not functioning correctly.. - Traffic going through the firewall. - Traffic going to the firewall.. - Troubleshooting Connectivity Through the Firewall. - No matter how well planned, tested, and implemented, sooner or later you will run into problems accessing resources through the firewall. - There are any number of reasons for this, but the most common reasons involve problems with the firewall ruleset, problems with the firewall translation tables, problems with Network Address Translation (NAT), or problems with how the application communicates over the network. - A good approach to troubleshooting connectivity through the firewall is to use the flowchart in Figure 13-2.. - The troubleshooting connectivity through the firewall flowchart is based on the general troubleshooting checklist but has been modified for this specific situation.
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