. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 43.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509 87.73. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 42.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508 86.74. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 42.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508 86.74. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 42.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507 86.74. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 43.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520 87.73. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 43.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520 87.73. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 43.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518 87.73. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 43.4. Secure Sockets Layer (SSL) Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518 87.73. SSL Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . browsers can then connect to ws://:1883 using a Web Socket to send and receive MQTT messages. SSL/TLS is also available, e.g.: tcp://host:8883?protocols=MQTT;s

causes users to be assigned a username and role corresponding to the subject DN from their SSL certificate. In these kinds of situations the broker will use this assigned (i.e. validated) username for that core clients will now expect the CN or Subject Alternative Name values of the broker's SSL certificate to match the hostname in the client's URL. This impacts all core-based clients including core connections between cluster nodes. Although this is a "breaking" change, not performing hostname verification is a security risk (e.g. due to man-in-the- middle attacks). Enabling it by default aligns core

that core clients will now expect the CN or Subject Alternative Name values of the broker's SSL certificate to match the hostname in the client's URL. This impacts all core-based clients including core connections between cluster nodes. Although this is a "breaking" change, not performing hostname verification is a security risk (e.g. due to man-in-the- middle attacks). Enabling it by default aligns core behavior with industry standards. To deal with this you can do one of the following: Update your SSL certificates to use a hostname which matches the hostname in the client's URL. This is the recommended