https://community.cisco.com/t5/network-security/firewal-asa-5515/m-p/2860155#M912066 <P>Hi,</P> <P></P> <P>I am setting up a NAT firewall.</P> <P>Could you help me understand why the below:</P> <P></P> <P>Asymmetric NAT rules matched for forward and reverse flows; Connection for udp src outside-AeC-EBT:10.230.127.35/55812 dst inside-AeC-EST:192.168.224.15/162 denied due to NAT reverse path failure</P> <P></P> <P></P> <P>Think you&nbsp;</P> Fri, 21 Feb 2020 13:50:59 GMT Manoel Goncalves 2020-02-21T13:50:59Z https://community.cisco.com/t5/network-security/firewal-asa-5515/m-p/2860155#M912066 <P>Hi,</P> <P></P> <P>I am setting up a NAT firewall.</P> <P>Could you help me understand why the below:</P> <P></P> <P>Asymmetric NAT rules matched for forward and reverse flows; Connection for udp src outside-AeC-EBT:10.230.127.35/55812 dst inside-AeC-EST:192.168.224.15/162 denied due to NAT reverse path failure</P> <P></P> <P></P> <P>Think you&nbsp;</P> Fri, 21 Feb 2020 13:50:59 GMT https://community.cisco.com/t5/network-security/firewal-asa-5515/m-p/2860155#M912066 Manoel Goncalves 2020-02-21T13:50:59Z https://community.cisco.com/t5/network-security/firewal-asa-5515/m-p/2860156#M912071 <P>Most often this happens when a specific NAT is defined in one direction and an "any" NAT covers the return path.</P> <P>If you can share your NAT configuration we can verify the problem. Otherwise check packet-tracer on the ASA for a more specific answer from the firewall directly</P> Thu, 16 Jun 2016 18:36:04 GMT https://community.cisco.com/t5/network-security/firewal-asa-5515/m-p/2860156#M912071 Marvin Rhoads 2016-06-16T18:36:04Z