Search code examples
tomcat

An unknown setting with identifier [8] and value [0] was ignored

I have this error in my Tomcat log file:

[2024-09-26 13:46:12] [warning] Connection [8], An unknown setting with identifier [8] and value [0] was ignored
[2024-09-26 13:46:14] [warning] Connection [9], An unknown setting with identifier [8] and value [0] was ignored

And I tried everything in my configuration files but I can't find the cause

Solution

  • This is the log of a web browser sending invalid HTTP2 code to the server.

    Tomcat should really log the IP so you can fail2ban them.