Hi,
> On Nov 26, 2025, at 11:39 PM, Guo Huiliang via lists.fd.io > <[email protected]> wrote: > > When I use Nginx as a reverse proxy, Nginx acts as a client and creates a TCP > connection on a specific port. In VPP's TCP protocol stack, there is > tcp_handle_cleanups—when the connection times out, it deletes the session and > the connection. This is the normal path for all connection cleanups. > However, after the connection is deleted, when the Nginx client initiates a > new connection using the same port again, session_lookup_connection_wt4 will > throw an error stating that the connection cannot be found, resulting in > communication interruption. How to resolve this issue? If this is a connect port reuse, i.e., src and dst port are reused, it’s probably not properly supported today. In fact, I’d expect connect to be refused with port in use due to error in transport_alloc_local_endpoint. This has been on our todo list for a while. If however the local port is not reused, this needs more debugging. Maybe related to the fib used. Regards, Florin > > the log as below: > Nov 27 07:13:57 ubuntu vpp[2224818]: tcp_handle_cleanups:1313: > opaque_conn_id: 3081261440 > Nov 27 07:13:57 ubuntu vpp[2224818]: session_transport_delete_notify:1201: > session index 160 delete, session state: 10, opaque_conn_id: 3081261440 > Nov 27 07:13:57 ubuntu vpp[2224818]: session_delete:284: session index 160 > delete > Nov 27 07:13:57 ubuntu vpp[2224818]: session_lookup_del_session:406: > [Preparing to delete listening connection | Local listening > address=172.16.102.211:16143 <http://172.16.102.211:16143/> | Session > index=160 | Peer listening address=118.195.243.98:443 > <http://118.195.243.98:443/>] > Nov 27 07:13:59 ubuntu vpp[2224818]: session_lookup_connection_wt4:1023: > session_lookup_connection_wt4: Listening connection not found (Local address: > 172.16.102.211:16143 <http://172.16.102.211:16143/>, Protocol=0) > Nov 27 07:13:59 ubuntu vpp[2224818]: session_lookup_connection_wt4:1027: > session_lookup_connection_wt4: Matching connection not found (Quadruple: > 172.16.102.211:16143 <http://172.16.102.211:16143/> -> 118.195.243.98:443 > <http://118.195.243.98:443/>, Protocol=0, FIB index=1, Namespace index=1) > > > Best regards, > Huiliang Guo > > >
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#26572): https://lists.fd.io/g/vpp-dev/message/26572 Mute This Topic: https://lists.fd.io/mt/116497693/21656 Group Owner: [email protected] Unsubscribe: https://lists.fd.io/g/vpp-dev/leave/14379924/21656/631435203/xyzzy [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
