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Overview:
The system uses cipher suites to negotiate security settings for network connections over TLS/SSL. This interface allows you to edit the TLS/SSL Cipher List and TLS/SSL Protocol list for cPanel, WHM, and Webmail.
We recommend that only advanced users edit the cipher and protocol lists.
cPanel & WHM supports Transport Layer Security (TLS) protocol version 1.2 and Transport Layer Security (TLS) protocol version 1.3:
- cPanel & WHM only supports TLSv1.2 or newer. The system enables TLSv1.2 by default.
- Not all clients will support TLSv1.3, which requires OpenSSL 1.1.1 or higher.
Defaults
By default, cPanel & WHM uses the following cipher list for web services:
ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
By default, cPanel & WHM uses the following protocol list for web services:
SSLv23:!SSLv2:!SSLv3:!TLSv1:!TLSv1_1
Edit the cipher list
To edit the cipher list, enter the appropriate cipher in the text box and click Save.
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The default cipher list is PCI compliant. To edit the cipher list to improve the security level on your server, read Apache’s SSLCipherSuite Directive documentation.
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We do not recommend that you edit the cipher list to lower the security level. Make certain that the cipher suite uses at least 128-bit encryption.
Edit the protocol list
To edit the protocol list, enter the appropriate protocol list in the text box and click Save.
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