Proxmox VM and host machine cannot make outgoing requests

I have setup proxmox on a dedicated server. I currently have one vm running on a dedicated IP address that works as expected. But I had to setup few more VM's that do not need to be accessed from the outside and for this I decided to use a NAT.

While setting up the VM behind a NAT I discovered that the VM while having access to the network it doesn't have complete access to the internet. It can successfully ping the outside world and resolve hostnames, but it is not able to make outgoing...

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