question Re: Unable to load the WEB UI of NIFI in Archives of Support Questions (Read Only)

Unable to load the WEB UI of NIFI

muh_umar_shafiq — Sat, 13 May 2017 00:19:38 GMT

Hi, I have successfully installed the NIFI on HDP 2.6. NIFI service is running and there is no error or warning in nifi-app.log file. Log file says that WEB UI of NIFI can be accessed at http://172.17.0.2:8079/nifi but when I hit this URL in my browser it does not open WEB UI.

Re: Unable to load the WEB UI of NIFI

MattWho — Sat, 13 May 2017 00:23:39 GMT

@Muhammad Umar

Can you ping that IP from the machine running your browser?

Make sure there isn't a firewall blocking access to port 8079.

Thanks, Matt

Re: Unable to load the WEB UI of NIFI

muh_umar_shafiq — Sat, 13 May 2017 00:44:06 GMT

@Matt Clarke

Ping says unknown host .. and secondly its not being blocked by firewall.

Re: Unable to load the WEB UI of NIFI

MattWho — Sat, 13 May 2017 00:53:31 GMT

Try using the telnet command verify you can connect to that port:

telnet 172.17.0.2 8079

Thanks,

Matt

Re: Unable to load the WEB UI of NIFI

MattWho — Sat, 13 May 2017 00:56:29 GMT

@Muhammad Umar

What do you see in your browser when you try to connect?

What NiFi version?

What browser version?

When you attempt to access that URL, what do you see in the nifi-user.log?

Thanks,

Matt

Re: Unable to load the WEB UI of NIFI

muh_umar_shafiq — Sat, 13 May 2017 01:12:45 GMT

1) in browser it says, this site cant be reached

2) Latest Version

3) Chrome - 58.0.3029.110

4) nifi-user.log file is empty

5) Telnet command says, connection refused

Re: Unable to load the WEB UI of NIFI

MattWho — Sat, 13 May 2017 01:29:21 GMT

@Muhammad Umar

If the following command shows NiFi is still running:

./nifi.sh status

and the following command shows NiFi listening on port 8079:

netstat -ant|grep LISTEN

Then the issue is not with NiFi.

There is something external to NiFi blocking connections to port 8079 from your host where your browser is running.

What OS version is running on the server/VM where NiFi is running?

Thanks,

Matt

Re: Unable to load the WEB UI of NIFI

muh_umar_shafiq — Sun, 18 Aug 2019 00:56:38 GMT

@Former Member Clarke

Yeah.. Nifi is running.

netstat -ant|grep LISTEN command showed me following result for my port:

tcp 0 0 0.0.0.0:8078 0.0.0.0:* LISTEN

I have changed the port from 8079 to 8078 but still the same issue.

I am using Hortanworks Sandbox (HDP 2.6) on my Laptop Windows is OS on my Laptop.

I installed the NIFI at below path:

Re: Unable to load the WEB UI of NIFI

MattWho — Sat, 13 May 2017 01:55:07 GMT

@Muhammad Umar

Both ports 8078 and 8079 are likely not being forwarded by your HDP sandbox and will need to be added.

https://hortonworks.com/hadoop-tutorial/sandbox-port-forwarding-guide/

Thanks,

Matt

Re: Unable to load the WEB UI of NIFI

muh_umar_shafiq — Sat, 13 May 2017 16:34:02 GMT

Hi @Matt Clarke,

I am able to access the NIFI UI now. Actually the problem was with the IP address. When I check the Inet address in VM console it showed me 192.168.5.128 and I connected to the VM from Putty using this Ip address. In Putty, when I checked the Inet address it showed me 172.17.0.2 and NIFI log file was also saying that you can access the NIFI UI at 172.17.0.2:port/nifi. But it was not loading using 172.17.0.2 then I tried opening NIFI UI at 192.168.5.128 and it worked. Why it is so? In my opinion, NIFI UI should open at 172.17.0.2:port/nifi instead of 192.168.5.128:port/nifi ??

Re: Unable to load the WEB UI of NIFI

MattWho — Tue, 16 May 2017 00:27:56 GMT

@Muhammad Umar

When NiFi starts and has not been configured with a specific hostname or IP in the (nifi.web.http.host=) in the nifi.properties file, it looks to bind to the IP address registered to every NIC card present on the host system. If you try to specify a hostname or IP that does not resolve or match the IP registered to any of your NIC cards, NiFi will fail to start. NiFi can not bind to a port that belongs to an IP it does not own. You can run the "ifconfig" command on the host running NiFi to see all NICs and the IP registered to them. You should see the 172.17.x.x address and not the 192.168.x.x address shown.

It definitely sounds like there is some network address translation going on here. The fact that you can reach NiFi over http://192.68.x.x:8078// confirms this. It is simply routing all traffic from the 192.169.x.x address to the internal 172.17.x.x address. We confirmed already your browser cannot resolve a path directly to 172.17.x.x, because if you could, NiFi's UI would have opened. NiFi is in fact bound to 172.17.x.x and not 192.168.x.x. NiFi cannot control how traffic is being routed to this endpoint by the network.

Thanks,

Matt