On 31/03/2020 11:20, Aditya Kumar wrote: > Tomcat 9.0.30 on Windows Server 2012 / Java 1.8 > > I've noticed on a freshly installed version of tomcat 9, upon startup there > are several connections to and from localhost on different ports > > For example on my tomcat server there are 4 connections to and from > localhost (output from netstat) > > TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 3972 > TCP 127.0.0.1:55618 127.0.0.1:55619 ESTABLISHED 3972 > TCP 127.0.0.1:55619 127.0.0.1:55618 ESTABLISHED 3972 > TCP 127.0.0.1:55620 127.0.0.1:55621 ESTABLISHED 3972 > TCP 127.0.0.1:55621 127.0.0.1:55620 ESTABLISHED 3972 > TCP [::]:8080 [::]:0 LISTENING 3972 > > These can grow to a large number (several thousand) on a busy system. What > are these connections used for? What caused them? What thread are they > attributed to?
The Java NIO implementation on Windows uses TCP for intra-process signalling. It opens a pair of self-connected sockets for every Selector. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
