I have Icewarp EMail Server and there is a Lets Encrypt cert created long ago. Many times I have renewed or created a new certs without problems in Icewarp administration console. But today I can't. Error is: Error when registering acme account. ACME Exception: Error registering: 405 HTTP/1.1 405 Not Allowed
Sorry for my English.
My domain is: mail.zeinet.kz
My web server is: Icewarp Email Server 22.214.171.124
The operating system my web server runs on is: Windows Server 2012 R2