je n'arrive pas à accéder a NIFI

English Screenshot: 

I can't access NIFI

Hello, I installed NIFI following the documentation, I obviously checked that I had the right java, but when I access the localhost portal, I can't, it gives me this: (Screenshot 1)

Of course I have it before, here is what the cmd says where I run it, also I can't find my identifiers as agreed in the log file, someone could help me please ((Screenshot 2)

Without knowing what you have configured, I will try and assume some of your configurations:
- based on your installation, I assume that you are using HTTP and not HTTPS, right? If I take a look in your screenshot, I can see that you are running on port 8443, which is the default port configured within nifi.web.https.port. I assume that you wrote the host and the port in the nifi.web.http.host and the nifi.web.http.port properties and not the HTTPS properties, right? If not, this is what might be causing your issue.
- besides that, have you check the logs for any errors and so on? I am talking here about the bootstrap logs (nifi-bootstrap.log) and the application logs (nifi-app.log). If everything starts normally, within the application logs you should see the link where NiFi is available. Otherwise, there is an error and you have to take a look.

PS: it would help if you could attach the nifi.properties here, with all the confidential information written as standard placeholders (like <hostname>, <password> , etc)

@dyhiamedjouti 

It would also be helpful if you shared the full version of Apache NiFi that you installed.
The latest versions of NiFi start as secured by default.  The Single User "username" and "password" are only output to the log the very first time NiFi is started.  Subsequent restarts of NiFi service will not log the username and password again.

You can stop your NiFi and run the following command to set your own single user identity provider username and password:

$ ./bin/nifi.sh set-single-user-credentials <username> <password>

Then when NiFi is up and running, you can use your set username and password to access the UI.

Not knowing your username and password has nothing to do with the browser not being able to load the NiFi UI for logging in.

When you launch NiFi, this starts the NiFi bootstrap process which will then launch a child process which is the main Nifi process.  When this sub process starts, logging will begin in the nifi-app.log.   The NiFi Ui will not be accessible until this process has loaded completely and successfully.  NiFi will log a few lines that contain UI is available at the following URLs.  You'll want to verify you find these log lines and the URLs listed.  These are the URLs you will use in your browser to access your NiFi.

If you do not see the URLs output in the logs, that means NiFi failed to successfully start.  Again the nifi-app.log should provide logging details as to why the sub-process failed during the startup process.  Commonly a result of misconfiguration.  If you are not seeing a nifi-app.log produced, then check for the nifi-bootstrap.log for any exceptions.

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Thank you,

Matt