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Hi,

SMTP Port 465 Open/Enable in IPv4 & IPv6 Firewall configuration but still it is not allowing to connect Gmail,
Error : SMTP -> ERROR: Failed to connect to server: Connection timed out (110).

When i Disable ConfigServer Firewall, it get successful connect & send email via Gmail/Hotmail(Outlook . com) SMTP.

No one able to resolve this problem,
Finally i resolved it by myself.

if anybody facing same problem then this is the Solution.

Remove Port "465, 587" from /etc/csf/csf.conf (SECTION:SMTP Settings)

Open csf.conf & Find "SMTP_PORTS"
SMTP_PORTS = "25,465,587" <-- (Remove Port 465 & 587 from here)

Restart Firewall & Problem will get resolve.