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Registering an SSL Certificate on the mail server
In a Windows platform, certificates can be registered into shared certificate containers which can be accessed via other SSL enabled applications. If an SSL certificate is already registered under the website running on the server or IIS then...
Try to use this command line your issue may be fixed.
Go to your server's shell as root
cd /usr/local/psa/var/modules/letsencrypt/venv/bin
./pip install --upgrade cryptography
try to use it I think it will be work for you
This is my.named.conf on my secondary DNS (ISPConfig)
zone "domain.org" {
type master;
file "domain.zone";
allow-transfer {195 ... ... ...; };
};
just make sure your firewall not blocked port tcp/ip