Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My web server is (include version):ICECAST media server
The operating system my web server runs on is (include version): Windows2012
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know): Yes Administrator
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):no
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 2.6.0
I have Certbot on 3 windows servers for use with Icecast. But the privkey file returned is 241bytes. On my other servers it is more like 2 or 3K Full and priv concatenated together should be about 8K and I have only 6K so looks like my PRIV is too small. I have renew, but same size. How can I fix this?
Just to try to explain a bit more, there are two common methods of cryptography: RSA and ECDSA. RSA is much older and is supported everywhere. ECDSA is newer, smaller (and thus often faster), and is supported almost (but not quite) everywhere.
Certbot 2 defaults to making ECDSA keys, because that's what most people should be using now.
There's nothing broken that you've described.
Pass --key-type rsa to certbot. But only do this if you actually need to support RSA systems. Almost everything should handle ECDSA now, unless it's really old.