![]() Kerio Connect's Let's Encrypt client will not be able to listen on port 80 as well. For instance, if a small business has Kerio Connect and IIS installed on one bare metal server with one network card, IIS is usually listening on port 80, making it impossible for Kerio Connect to listen on port 80. Point 2 can be an issue for small businesses who have one bare metal server with multiple instances of server software installed. It is better to bind the Kerio installation to a specific network card in the server or virtualize the installation. However, this is not practical in many settings. Users could keep the security policy set to encrypted, then change the security policy to "no restriction" on the day Let's Encrypt needs to renew. Eventually, the connection is never received. Meanwhile Kerio Connect's Let's Encrypt ACME client will still be listening on port 80. When Let's Encrypt makes the connection on port 80 (unencrypted), Kerio will redirect the connection to HTTPS (port 443/8843). Some Kerio Connect administrators encrypt all traffic to Kerio Connect. Point three can be an issue for some installations of Kerio Connect. But as with all features, there could be some issues. Once Kerio is set-up, Let's Encrypt certificates install in about 2-3 seconds. Connections can still be negotiated to use TLS, but Kerio Connect will accept non-encrypted traffic when the security policy is set to "No restriction." Making this changes does not mean all connections are insecure. Kerio Connect' Security policy has to be set to "No restriction." Go to Configuration > Security > Security Policy. You can set the service to run automatically to help Kerio Connect's Let's Encrypt ACME client renew the certificate.ģ. Go to Configuration > Services > HTTP should have "All addresses:80" listed. The HTTP service should be running on Port 80. Make sure Kerio Connect is listening on Port 80. ![]() In addition, make sure no other software on the Kerio Connect server is listening on port 80 using the same network card/IP address as Kerio Connect.Ģ. Also, make sure that port 80 traffic is being forwarded to the correct IP if Kerio Connect is bound to a specific IP or network card. Make sure the firewall has port 80 open and directing traffic to the Kerio Connect server. Users may have to make a few changes to their Kerio Connect installation in order to use Kerio Connect's new Let's Encrypt ACME client to receive, auto install and update Let's Encrypt certificates.ġ. Re: Kerio connect 9.4 new Let's encrypt certificate error
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