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Your Proxy will be protected by a security group.
Can you verify that the security group/any NACL's allow access from your S2S VPN?
Also you say that the host cant be found.. Can you resolve VIA DNS its IP Address if using a name?
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I checked the security groups. For testing I allowed Port 1433 on 0.0.0.0/0 but that does not help. NACL's allow everything from 0.0.0.0/0 (inbound and outbound).
From outside the VPN I can resolve the DNS and get back the IP 192.168.1.1. Inside the VPN it is blocked by firewalls, therefore I have to use the IP directly. I would expect that doesn't matter anything if I use IP direct.
Can you clarify.