I’m currently attempting to connect to a Windows machine via RDP using IPv6
through Guacamole, but it's failing. IPv4 works fine, but with IPv6, I
receive the following error:

Loading keymap "base"
guacd_compose | guacd[2819]: INFO:     Loading keymap "en-us-qwerty"
guacd_compose | guacd[2819]: INFO:     RDP server closed/refused
connection: DNS lookup failed (incorrect hostname?)
guacd_compose | guacd[2819]: INFO:     User
"@e9c97c11-47d1-4853-a914-2aeea9fccc3e" disconnected (0 users remain)
guacd_compose | guacd[2819]: INFO:     Last user of connection
"$69cf5743-1437-41f1-a47c-09024d77c4e2" disconnected

It appears guacd is unable to resolve or reach the IPv6 address.

*IPv4 connections use the hostname or IPv4 address and work correctly.*

*Questions:*

   1.

   Do I need to configure anything specifically for IPv6 in guacd?
   2.

   Should I adjust guacd.conf (e.g., bind_host) or update DNS/AAAA records?

Any insight or configuration tips to get RDP working over IPv6 in Guacamole
would be greatly appreciated.

Thanks in advance!

*Note *: RDP over IPv6 on the RDP server is enabled and confirmed through
nmap -6 -sV -p 3389 [<IPv6_address>]

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