Port problems, how to solve?

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visoVV2020-07-13 15:10:30

iptables

visoVV, 2020-07-13 15:10:30

Port problems, how to solve?

Opened port 2500
-A INPUT -p tcp -m tcp --dport 2500 -j ACCEPT
Until today everything worked perfectly.

I started getting the error
Timed out, status = ETIMEDOUT while connecting from you-it.ru (0.0.0.0) to [127.0.0.1] (127.0.0.1)

Checking the port

lsof -i :2500
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
pmtad 896 pmta 37u IPv6 3671916929 0t0 TCP *:rtsserv (LISTEN)

It turns out that he only wants to communicate with ipv6?
How to do with ipv4?

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