I have tested with Tomcat 11.0.9 and JDK 21.0.8+9. Both of these are the latest versions and I see the issue below with TCP connections being refused though my server resources are fine.
Regards, John -----Original Message----- From: r.barc...@habmalnefrage.de.INVALID <r.barc...@habmalnefrage.de.INVALID> Sent: Thursday, August 7, 2025 4:16 AM To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Tomcat acceptCount limitation and connection refused errors [You don't often get email from r.barc...@habmalnefrage.de.invalid. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. > 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. Hi, This also seems to be an issue on the JRE/JDK level if an older version is used: https://bugs.openjdk.org/browse/JDK-8330940 Regards, Reg --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org