Hi, I have Tomcat 11 running on Windows. When I get a spurt of connections, the client sees "Connection Refused" errors sporadically. I have tried increasing the acceptCount for the connector and that does not help.
>From what I am reading, this appears to be a because of the default TCP >Backlog setting at the OS level. Windows has this limit set to 200, so if >there are more than 200 simultaneous connection attempts, some connections get >refused. I have verified that there is no CPU/memory bottleneck on the server, ephemeral port usage is very low, so this is definitely a TCP backlog issue. On Windows, there appears to be a way to increase the TCP backlog queue - see https://lists.apache.org/thread/bg65sgvxr8rghzb9ybzbd15ctb568562. This setting is at the socket level, rather than an OS setting. Does Tomcat provide a way to increase the OS level TCP backlog queue length, and if not, can this be considered in the roadmap? This seems to be a scalability issue for Tomcat - 200 concurrent connection limit appears to be a very low number. Please correct me if I am wrong. Regards, John --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
