Verifying VPN Servers using LetsDANE

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I've been experimenting with using the LetsDANE http proxy to connect to a VPN server, but I end up running into errors when trying to validate SSL. (Both with and without a reverse proxy)

The only noticeable error I received was this:

C0CC8B6670000000:error:0A000126:SSL routines:ssl3_read_n:unexpected eof while reading:ssl/record/rec_layer_s3.c:321:

This is the error that occurred without using reverse proxy - The VPN server has the cert set directly through the VPN software, and then I specified the IP address of the VPN server in the DNS for the Handshake domain.