Fellow Qt Enthusiasts:
It is happening again.
I have a client server/app which uses Qt for the socket communication.
Occasionally it gets sick. When it is sick:
1 - It takes multiple attempts for a client to connect to the server.
The connection attempts fail with: *ERROR*, server communication error:
RemoteHostClosedError.
After several attempts it works. The sicker it gets the more attempts it
takes
to connect.
2 - During these periods, the invalid SYN cookies number on the server steadily
rises:
>netstat -ts | grep SYN
302658 invalid SYN cookies received <-------
>netstat -ts | grep SYN
302745 invalid SYN cookies received <-------
3 - If I restart the server process, all is well for a while.
4 - This is not something which can be reproduced on demand.
5 - The server machine is not heavily loaded during these times.
The server image size is 275 Mb.
It has 61 files open.
The 1-min load average is 0.32
The server has been running for 11 days.
The system is built with Qt-4.8.6, but I have no
evidence that this problem is related to the use of Qt.
It is running on RHEL 6.6
Any suggestions would be greatly appreciated.
Thanks.
Bill
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