When devices on your network are unable to access resources or services located outside of your network, it is likely due to firewall rules or settings, which is why pfSense is blocking outbound traffic. At Bobcares, with our pfSense Support Services, we can handle your pfSense issues.

Why pfSense is Blocking Outbound Traffic?

When devices on the network are unable to access resources or services located outside of the network, it is likely due to firewall rules or settings, which is why pfSense is restricting outbound traffic. Requests by devices on the network to connect to servers, webpages, or online services contribute to outbound traffic. Some of the causes and solutions for this error include:

1. pfSense works on a “deny all” rule by default for both outgoing and incoming traffic. This implies that no traffic will occur unless particular rules permit it. Also, outbound traffic will not occur by default if we haven’t set up any outbound firewall rules to permit it.

2. Outbound traffic may be stopped if we have pfSense firewall rules that unintentionally prohibit it, either expressly or as a result of rules that contradict. Make sure the rules are set up correctly by checking them.

3. Stateful packet inspection (SPI), used by pfSense, keeps track of the status of open connections. The firewall may also mistakenly block outgoing traffic if it is not keeping track of outgoing links or if there are problems with the status table.

4. Make sure the setup of aliases and groups is correct. Improperly set groups or aliases may cause unwanted blocking of the traffic.

5. Blocking outgoing traffic can also result from problems with the gateway configuration or the NAT settings in pfSense. Also, make sure the NAT and gateway setup are correct by checking them.

6. We can’t use certain IP addresses considering their reputation if we’re using technologies like pfBlockerNG with IP reputation lists. So, verify that these lists aren’t mistakenly blocking IP addresses that are valid.

7. Problems with DNS resolution can appear as outward traffic jams if outbound traffic depends on DNS resolution to access external resources. So, make sure the network’s DNS resolution is working properly.

8. If QoS or traffic shaping policies are set up in pfSense, it can unintentionally slow or prioritize outgoing traffic in a way that makes it look like it is in a block state.

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Conclusion

The article explains the causes of the “pfSense is Blocking Outbound Traffic” issue and the respective solutions for each of them.