diff --git a/doc/09-object-types.md b/doc/09-object-types.md
index 16b1d582c..09d82c5cc 100644
--- a/doc/09-object-types.md
+++ b/doc/09-object-types.md
@@ -1102,7 +1102,7 @@ Configuration Attributes:
   accept\_config                        | Boolean               | **Optional.** Accept zone configuration. Defaults to `false`.
   accept\_commands                      | Boolean               | **Optional.** Accept remote commands. Defaults to `false`.
   max\_anonymous\_clients               | Number                | **Optional.** Limit the number of anonymous client connections (not configured endpoints and signing requests).
-  cipher\_list                          | String                | **Optional.** Cipher list that is allowed. For a list of available ciphers run `openssl ciphers`. Defaults to `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:DHE-RSA-CHACHA20-POLY1305`.
+  cipher\_list                          | String                | **Optional.** Cipher list that is allowed. For a list of available ciphers run `openssl ciphers`. Defaults to `ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256`.
   tls\_protocolmin                      | String                | **Optional.** Minimum TLS protocol version. Since v2.11, only `TLSv1.2` is supported. Defaults to `TLSv1.2`.
   tls\_handshake\_timeout               | Number                | **Deprecated.** TLS Handshake timeout. Defaults to `10s`.
   connect\_timeout                      | Number                | **Optional.** Timeout for establishing new connections. Affects both incoming and outgoing connections. Within this time, the TCP and TLS handshakes must complete and either a HTTP request or an Icinga cluster connection must be initiated. Defaults to `15s`.
@@ -1395,7 +1395,7 @@ Configuration Attributes:
   key\_path                 | String                | **Optional.** Path to the private key.
   ca\_path                  | String                | **Optional.** Path to the CA certificate to use instead of the system's root CAs.
   crl\_path                 | String                | **Optional.** Path to the CRL file.
-  cipher\_list              | String                | **Optional.** Cipher list that is allowed. For a list of available ciphers run `openssl ciphers`. Defaults to `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:DHE-RSA-CHACHA20-POLY1305`.
+  cipher\_list              | String                | **Optional.** Cipher list that is allowed. For a list of available ciphers run `openssl ciphers`. Defaults to `ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256`.
   tls\_protocolmin          | String                | **Optional.** Minimum TLS protocol version. Defaults to `TLSv1.2`.
   insecure\_noverify        | Boolean               | **Optional.** Whether not to verify the peer.
   connect\_timeout          | Number                | **Optional.** Timeout for establishing new connections. Within this time, the TCP, TLS (if enabled) and Redis handshakes must complete. Defaults to `15s`.
diff --git a/lib/base/tlsutility.hpp b/lib/base/tlsutility.hpp
index 157fa147c..968e55a19 100644
--- a/lib/base/tlsutility.hpp
+++ b/lib/base/tlsutility.hpp
@@ -25,8 +25,10 @@
 namespace icinga
 {
 
-// Source: https://ssl-config.mozilla.org
-const char * const DEFAULT_TLS_CIPHERS = "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:DHE-RSA-CHACHA20-POLY1305";
+// Source: https://ssl-config.mozilla.org, i.e.
+// 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:DHE-RSA-CHACHA20-POLY1305
+// Modified so that AES256 is preferred over AES128.
+const char * const DEFAULT_TLS_CIPHERS = "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256";
 
 const char * const DEFAULT_TLS_PROTOCOLMIN = "TLSv1.2";
 const unsigned int DEFAULT_CONNECT_TIMEOUT = 15;