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IPv6 Web Page connections not working over Secure Gateway

I have a Secure Gateway set up in RoyalTSX 6.2.1, which is a jumpbox in the public subnet in AWS. I am using it to get to EC2 instances in the private subnet over SSH/RDP/HTTP. Everything works great except IPv6 Web Page connections.

I have some Jenkins servers running on port 8080. I can reach the IPv4 Jenkins server web page through the secure gateway, but IPv6 web page connections don't work. Instead of mapping the remote host's IPv6 address to IPv6 loopback address of [::1], it tries to map to 127.0.0.1 and fails. I don't see any option to map it to [::1] or force IPv6

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Update - I added a DNS entry for the IPv6 host, and using the hostname for the connection works fine, it loads the page on 127.0.0.1 on an open port. But connecting to the actual IPv6 address still does not work as shown in the attached screenshots above

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