The connection registered by the client is normal, and the client can send 
messages and renew the registration normally, but the push message to the 
client using uac_req_send() from kamailio fails.
Location information after the client is registered:

]#kamcmd ul.lookup location test01
Received: sip:10.11.40.XX:57646;transport=tls

]#netstat -anp | grep 57646
 "tcp 0  0 10.11.55.xx:5061   10.11.40.XX:57646 ESTABLISHED  3467/kamailio"

kamailio.lua
KSR.pv.sets("$uac_req(ouri)", rows.received)

In this way, most users can receive messages normally, but occasionally some 
users cannot receive messages but can renew their registration and send 
messages normally. Once this is the case for this user, the use of 
uac_req_send() will continue to fail until the client establishes a new 
connection.

If a problem occurs, the following logs are displayed on the server:
2024-02-20T10:01:25.329595+08:00 10.11.55.XX (72819) ERROR: <core> 
[core/tcp_main.c:4692]: tcpconn_main_timeout(): connect 10.11.40.XX:57646 
failed (timeout) 

The connection already exists and should be normal, why does 
"tcpconn_main_timeout(): connect 10.11.40.XX:57646 failed (timeout)" occur.
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