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

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> 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

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