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SMTP port open - but not open

In my similar situation It was because I had two firewalls (CSF & UFW) installed and working at same time which I didn't noticed about one of them which caused unexpected behaviour.
Mojtaba Rezaeian's user avatar
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Solved - port-forwarding to KVM VM on Ubuntu

Solution : After setting POSTROUTING at nat table, the problem solved!!! iptables -t nat -A POSTROUTING -s -j SNAT --to-source To specify destination port, use ...
hwang's user avatar
  • 11
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2 OpenVPN connections routing to forwarded port only works when 1 connection is down

Because your tun0 vpn adds default route "overrides" (i.e., the /1 routes, which ARE what you want apparently), (encapsulated) traffics sent by the tun1 vpn server (to clients in a "...
Tom Yan's user avatar
  • 1,028

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