We\'re running a web app on Tomcat 6 and Apache mod_proxy 2.2.3. Seeing a lot of 502 errors like this:
Bad Gateway! The proxy server received an in
I'm guessing your using mod_proxy_http (or proxy balancer).
Look in your tomcat logs (localhost.log, or catalina.log) I suspect your seeing an exception in your web stack bubbling up and closing the socket that the tomcat worker is connected to.