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What port to allow for "Redirect Internet traffic" to WAN ?

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Tigzy

Occasional Visitor
Hello,
I've configured my firewall as whitelist, and allow the following ports: 80, 443
I've setup an OpenVPN with "Redirect Internet traffic" to exclude 1 specific IP from tunnel, it goes to WAN.

However, when that IP is going to TUN internet works, but when I redirect to WAN, internet doesn't work anymore.
When I add the IP in firewall whitelist, it works.
When I switch the VPN off, internet works.

So I'm wondering, is there any port forwarding that I don't know when VPN is bypassed?
Do I need to open specific port?
 
Ok, I think I fixed it. I had to open port 53/UDP for DNS requests as well. I'll wait a bit but it's in good shape.
 

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