there is one warning firewall is not functioning correctly

The first step of troubleshooting is to always verify that the problem being reported is the problem that is occurring, and not merely a symptom of the problem. Review the firewall translation configuration.Īlthough these steps may seem to be many of the same steps as previously discussed, it is important to consider the context of the problem, namely passing traffic through the firewall, as you apply each step in the checklist. Verify that the remote application is running and accessible locally. This section covers each step from the flowchart in turn as follows: Troubleshooting Connectivity Through the Firewall The troubleshooting connectivity through the firewall flowchart is based on the general troubleshooting checklist but has been modified for this specific situation.įigure 13-2.

A good approach to troubleshooting connectivity through the firewall is to use the flowchart in Figure 13-2.

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. No matter how well planned, tested, and implemented, sooner or later you will run into problems accessing resources through the firewall. To assist in troubleshooting these situations, implement your firewall troubleshooting checklist as it applies to the scenario in question. Understanding this, you can further narrow down the process to two things: Three predominant situations with firewalls require some form of troubleshooting:Īccess to protected resources from unprotected networks is not functioning correctly.Īccess to unprotected resources from protected networks is not functioning correctly.Īccess to the firewall itself is not functioning correctly.

There is one warning firewall is not functioning correctly