> We see that diffie-hellman-group14-sha256 support has recently been 
> added to libssh2 but that it is not yet in any release.  Does anyone 
> know when an official release containing this key exchange algorithm 
> will be available?

We don’t have a release scheduled, but hopefully soonish.

> Some other connections fail because LIBSSH2_DH_GEX_MAXGROUP is too 
> small.  These customers' machines reject values lower than 4096 by 
> default but libssh2 only offers the range from 1024 to 2048.  Do you 
> have any plans to raise the MAXGROUP value?  Openssh has a min/max range 
> of 2048/8192 so perhaps that could be adopted in libssh2.

Thanks for bringing this to our attention, I’ve submitted a PR to update these 
values based on RFC 8270 which matches OpenSSH.

Cheers,

Will
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