@Hank21 The block_all rule, if I change the Source to "Me", it doesn't block anything. IPsec VPN is connected to AWS Site-to-Site VPN. There is nothing special about it. In fact, I followed this post...

@Hank21 Hi Hank, Thank you for your suggestion. I tried yours but pgAdmin4 still doesn't connect. Currently, I have these rules in my firewall.

Hi, guys. I would like to know if I can block all the traffic except the traffic over the IPsec VPN. We have AWS RDS (Postgres) database, we would like to block all communication from specific...