NtoPng port Problem.

[hny1]

i have recently Installed ntopng package .
to access it by web the default port is 3000. it only give me access for 2-3 minutes. after that nothing is shown in web browser.
if i change to port from 3000 to anyone xxxx. using command "ntopng -i 1 –http-port 6000 --user root"
it give a access again for 2-3 minutes with new port.

that is the reason behind this?

[RonpfS]

Do you have snort/suricata alerts ?

[hny1]

no i have not installed these packages.
apart this i have noticed in services. ntopng service went stopped after short interval of time.