GitHub user PPisz added a comment to the discussion: vpn - Peer requested 
tunnel 1 twice, ignoring second one

The cause was incorrect routing on the VR. The primary public IP was from one 
addressing, and the IP on which the SNAT was located was from a different 
addressing (and the default gw was set to that addressing). The VPN wouldn't 
connect because responses to the client were coming from the SNAT IP, not the 
primary IP. The solution was to swap the primary IP so that all public IPs were 
from the same network.

GitHub link: 
https://github.com/apache/cloudstack/discussions/11224#discussioncomment-14001213

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