Out going traffic issue

Hi, I having outgoing traffic related issue with our server, we have received notice from our data center if not fixed then they may terminate our service, I am pasting the log here can anyone help me to fix this issue? Moderation Notice: The log output was removed due to the inclusion of real IP addresses. Here's an edited output that makes use of example IP addresses:

server 1.2.3.4:42360 - 2.3.4.5:25 TCP (Flags: ACK)
server 1.2.3.4:45412 - 5.6.7.8:25 TCP (Flags: ACK)
server 1.2.3.4:55434 - 1.2.3.4:25 TCP (Flags: PUSH ACK)
server 1.2.3.4:47518 - 8.7.6.5:25 TCP (Flags: SYN)
server 1.2.3.4:55766 - 2.1.2.1:25 TCP (Flags: ACK)

cPanelMichael

April 19, 2019 19:37

Hello @Rajesh Chauhan, The log output shows the traffic is coming from port 25 (SMTP). You may want to try installing the CSF firewall: Then, enable/configure the CSF SMTP_BLOCK option. You can read more about this option on the following thread: Thank you.

Rajesh Chauhan

April 19, 2019 19:42

I have blocked as per tutorial

April 20, 2019 10:05

@cPanelMichael Hi, I have blocked port 25 in CSF but its still having same issue my IPs got null route for the same reason [removed output due to use of real IP addresses]

April 22, 2019 16:45

I have blocked port 25 in CSF but its still having same issue my IPs got null route for the same reason

Can you share the specific changes you made in your CSF configuration? Thank you.

Out going traffic issue

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