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Too many LAST_ACK by netstat -an

Hi,

I have tried port a web server to DM365 platform, and use a client to keep access by the web server, after long run some time, I find that I can't access the device though the web server any more, I have tried type the command "netstat -an" in console and find there are many tcp session in LAST_ACK state.

As my understanding, it may caused by not received the ACK from remote after send out the last FIN, but it should be finished after wait for a timeout, right? But these state keep over several hours.

Anyway who can tell me the timeout on DM365 linux? is there any way that we can change the timeout value?