2/13/2023 0 Comments Kerio connect smtpNote: Results from MxToolbox might not always be accurate or updated. The successful output will be similar to the following:įor more information about different commands, you can refer to the official OpenSSL documentation or the OpenSSL s_client Commands third-party reference documentation. Once the SSL/TLS configuration has been changed, it is recommended to run the OpenSSL s_client validation commands from the Linux/macOS machine.įor example, to check if the server supports TLSv1.2, please run the following command: openssl s_client -connect : -tls1_2 If it has not been set, Google Chrome might show a Not Secure website message. To resolve compatibility issues, configure the SSL Certificate Authority with Certificate Transparency = Yes. The Google Chrome browser might have some compatibility issues with OCSP (Online Certificate Status Protocol) stapling. ![]() List all strong ciphers by running the standard OpenSSL command: openssl ciphers 'HIGH:!aNULL:!MD5' ![]() Test the SSL/TLS settings by using the SSL Labs website. Here is an example of the mailserver.cfg settings, which includes the variables listed above: This variable allows Kerio Connect to decide which cipher set to use regardless of the client's preferences. This variable should be modified in both Security and SmtpSecurity tables. Permanently deletes a cipher from the list's Securityand SmtpSecuritytablesĮxcludes a cipher from the list (can be overwritten by the next ciphers) ServerTlsCiphers and ClientTlsCiphers will be the following: AESGCM:HIGH:+EDH-DSS-DES-CBC3-SHA:+DES-CBC3-SHA :!ECDHE-RSA-AES256-SHA384 AESGCM:HIGH:+EDH-DSS-DES-CBC3-SHA:+DES-CBC3-SHA: !ECDHE-RSA-AES256-SHA384 ! (exclamation point) Modify the server and the Client TLS cipher variables to delete the cipher from the list permanently. Note: In the OpenSSL site, the cipher is equal to the ECDHE-RSA-AES256-SHA384 value. To use a custom cipher list, type the cipher list in the matching variable from the OpenSSL manual page (i.e., the first weak cipher: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384).Leave the variable empty to use a default cipher list: AESGCM:HIGH:+EDH-RSA-DES-CBC3-SHA:+EDH-DSS-DES-CBC3-SHA:+DES-CBC3-SHA Kerio Connect's security variables exist in the mailserver.cfg configuration file, which is located in the Kerio Connect installation directory. You may need to adjust the security settings to resolve a flaw in the security protocol or to get a good security rating for your server. Sending server negotiated an old and insecure TLS version, TLSv1.1, sending server will need to be upgraded to support at least TLSv1.2Īdapted settings should help in passing the Audit vulnerability assessment check. The following failure may appear in Mail logs: The file allows configuring Server, Client TLS protocols, custom SSL ciphers, and Diffie-Hellman key exchange method. If these resources are permanently overloaded, click Tasks> Restart and then check storage usage again.While performing SSL protocol security scans, the SMTP and email Encryption settings can be modified using mailserver.cfg file. You can also choose a Time Interval and view the CPU and RAM usage details according to it.Īdditionally, lack of system resources may seriously affect the functionality of Kerio Connect. Short time peak load rates can be caused, for example, by the network activity.Ĭurrently used space and free space on the disk or a memory card. Check the option Require SSL-secured connection. If possible, use an SMTP server within the local network. ![]() Enter the DNS name or IP address of the server in the Server field. ![]() Go to Status > System Health to view the current usage of CPU, RAM and the disk space on the machine where Kerio Connect is installed. In the administration interface, go to Remote Services > SMTP Relay. To display currently opened folders, go to Status > Opened Folders. Kerio Connect also allows you to view which email folders are being used by the users. To display connections established to Kerio Connect's web interfaces and session expiry times, go to Status > Active Connections > Active Web Sessions. Go to Status > Active Connections to view all network connections established with the server. statistics, and so on.ĭisplaying users currently connected to Kerio Connect The statistics are divided into groups, for example, Storage Occupied, Messages sent to parent SMTP server, Client POP3 Post Office Protocol 3 - A protocol used by local email clients to retrieve emails from mailboxes over a TCP/IP connection. In the Kerio Connect administration interface, go to Status > Statistics to view the Kerio Connect statistics. Here you can view the number of connections to individual services of Kerio Connect and the number of processed messages (both incoming and outgoing) for a given period in graphical format. In the Kerio Connect administration interface, go to Status >Traffic Charts. These settings do not apply if you use a relay SMTP server.
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