https://community.cisco.com/t5/network-security/error-message-in-asymmetric-nat-with-vpn/m-p/3812505#M11573 Hi,<BR />I would guess your outbound traffic matches 1 nat rule and the return traffic matches another, hence the asymetric error. <BR /><BR />Please the configuration of the ASA reporting this error<BR />Please provide the output from "show nat detail" and indicate the source and destination networks.<BR /> Fri, 01 Mar 2019 13:23:50 GMT Rob Ingram 2019-03-01T13:23:50Z https://community.cisco.com/t5/network-security/error-message-in-asymmetric-nat-with-vpn/m-p/3812361#M11572 <P>Hello everyone&nbsp;</P><P>I have tunnel vpn between 2 branches and it's working fine but the services between them as voip server and can make call between 2 extension as 1 extension in branch 1 and other extension in branch 2,</P><P>In asa sniffer I'm saw the error message "</P><P>%ASA-5-305013: Asymmetric NAT rules matched for forward and reverse</P><P>flows; Connection <EM>protocol</EM> src <EM>interface_name</EM>:<EM>source_address</EM>/<EM>source_port </EM>[(<EM>idfw_user</EM>)] dst <EM>interface_name</EM>:<EM>dst_address</EM>/<EM>dst_port </EM>[(<EM>idfw_user</EM>)] denied due to</P><P>NAT reverse path failure."</P><P>My problem is one branch can't hear other branch,</P><P>Any one help to solve the problem</P><P>THANKS</P><P>&nbsp; &nbsp;</P> Fri, 21 Feb 2020 16:52:59 GMT https://community.cisco.com/t5/network-security/error-message-in-asymmetric-nat-with-vpn/m-p/3812361#M11572 hunterman 2020-02-21T16:52:59Z https://community.cisco.com/t5/network-security/error-message-in-asymmetric-nat-with-vpn/m-p/3812505#M11573 Hi,<BR />I would guess your outbound traffic matches 1 nat rule and the return traffic matches another, hence the asymetric error. <BR /><BR />Please the configuration of the ASA reporting this error<BR />Please provide the output from "show nat detail" and indicate the source and destination networks.<BR /> Fri, 01 Mar 2019 13:23:50 GMT https://community.cisco.com/t5/network-security/error-message-in-asymmetric-nat-with-vpn/m-p/3812505#M11573 Rob Ingram 2019-03-01T13:23:50Z