The setting of the max-connection tag of the resin-web.xml is the maximum number of DB connection.
If you try to use DB connection which exceeds the setting value of the max-connections tag, it remains a wait status until the connection is secured.
The setting of the thread tag of the request-control-config.xml is the number of simultaneous processing of the server.
If requests to the server is over a value of the thread tag, they are accumulated in a queue in a waiting state.
Although the settings above are different, the behaviors on the browser side are almost same as each other such as with the screen becoming white in a wait state.
It is necessary to understand and properly separate the details above.
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iAP/Accel Platform/All Updates
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FAQID:430