how to hide server banner info "Apache-Coyote 1.1" for the security reason

how to hide server banner info "Apache-Coyote 1.1" for the security reason

hello
how can I hide our server banner information for better security?

I could hide 
X-Powered-By: Servlet 2.4; Tomcat....................................

I added these tags in Server.Xml file (Tomcat Config) :
  server="MyServerrrr"
  xpoweredBy="false"


the xpoweredBy tag is ok but the Server tag doesnt work and still is "Apache-Coyote 1.1"
please help me

thank u

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