Not able to access NiFi web UI

[#1]

yesterday, I have installed Apache NiFi in my Linux Server root directory as per in the administration guide and its started and worked fine till yesterday but it is not working today. The error in web UI is "The connection was reset" but in my Linux status it shows Nifi running.

[#2]

Thanks@Jitendra Yadav

Selinux is already disabled but i got the error still

Jitendra Yadadisabled - SELinux is fully disabled. SELINUX=disabled

[#3]

Yes, disabled - SELinux is fully disabled. SELINUX=disabled

it fully disabled

[#4]

@Iyappan Gopalakrishnan

Here is primer and best practice please try increasing the limits and retest

Geoffrey

[#5]

I have done all but except

Set how long sockets stay in a TIMED_WAIT state when closed

Because it shows Error:

error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait" is an unknown key

[#6]

What version of Linux is your server and protocol ? ipv4 or ipv6

Put some value like net.netfilter.nf_conntrack_tcp_timeout_time_wait = 30

[#7]

its ipv4 and tried to put net.netfilter.nf_conntrack_tcp_timeout_time_wait = 30 and receive same "is an unknown key"

[#8]

Iyappan Gopalakrishnan

Please check for firewall issues as well.

[#9]

i check firewall also but issue continuous remains same...

[#10]

Are there any WARN/ERROR messages being produced in the nifi-app.log or nifi-bootstrap.log?

[#11]

Is your NiFi configured to run http or https?