Webserver losing traffic

Webserver losing traffic References I have my e-commerce application running on Ubuntu 12.0.4 on Tomcat 7 servlet. I get around 7000000 hits everyday on this webserver. However I suspect that the webserver is discarding some traffic (sending 503 responses) to a fair bit of traffic. Is there a way to know (through some log file on the server) how much traffic it has discarded due to it being busy?