Apache Nifi Web UI Setup

[#1]

Hello. I've been following this tutorial (https://www.batchiq.com/nifi-configuring-ssl-auth.html) to the best of my ability, yet the web UI still does not want to start. I get the error message ERR_CONNECTION_REFUSED" when trying to access the nifi server through Google Chrome. It has also been this way when trying to access through Firefox, so I suppose this is more of a server error than anything else. The following is a relevant section of my conf file...

# web properties #
nifi.web.war.directory=./lib
#nifi.web.http.host=
#nifi.web.http.port=8080
nifi.web.http.network.interface.default=
nifi.web.https.host=
nifi.web.https.port=8443
nifi.web.https.network.interface.default=
nifi.web.jetty.working.directory=./work/jetty
nifi.web.jetty.threads=200
nifi.web.max.header.size=16 KB
nifi.web.proxy.context.path=
nifi.web.proxy.host=

# security properties #
nifi.sensitive.props.key=SyoerSecretFlyingPassword
nifi.sensitive.props.key.protected=SuperSecretFlyingPassword
nifi.sensitive.props.algorithm=PBEWITHMD5AND256BITAES-CBC-OPENSSL
nifi.sensitive.props.provider=BC
nifi.sensitive.props.additional.keys=

nifi.security.keystore=server_keystore.js
nifi.security.keystoreType=JKS
nifi.security.keystorePasswd=SuperSecret
nifi.security.keyPasswd=SuperSecret
nifi.security.truststore=server_trustore.jks
nifi.security.truststoreType=JKS
nifi.security.truststorePasswd=SuperSecret
nifi.security.user.authorizer=managed-authorizer
nifi.security.user.login.identity.provider=
nifi.security.ocsp.responder.url=
nifi.security.ocsp.responder.certificate=

And here is the part of my log where the error message shows up...

2019-10-08 09:16:31,472 INFO [main] org.apache.nifi.NiFi Launching NiFi...
2019-10-08 09:16:31,791 INFO [main] o.a.nifi.properties.NiFiPropertiesLoader Determined default nifi.properties path to be 'C:\Users\SPLASH~1\Desktop\PROGRA~1\Apache\NIFI-1~1.2-B\NIFI-1~1.2\.\conf\nifi.properties'
2019-10-08 09:16:31,791 INFO [main] o.a.nifi.properties.NiFiPropertiesLoader Loaded 149 properties from C:\Users\SPLASH~1\Desktop\PROGRA~1\Apache\NIFI-1~1.2-B\NIFI-1~1.2\.\conf\nifi.properties
2019-10-08 09:16:31,985 ERROR [main] org.apache.nifi.NiFi Failure to launch NiFi due to java.lang.IllegalArgumentException: There was an issue decrypting protected properties
java.lang.IllegalArgumentException: There was an issue decrypting protected properties
at org.apache.nifi.NiFi.initializeProperties(NiFi.java:337)
at org.apache.nifi.NiFi.convertArgumentsToValidatedNiFiProperties(NiFi.java:305)
at org.apache.nifi.NiFi.main(NiFi.java:296)
Caused by: org.apache.nifi.properties.SensitivePropertyProtectionException: The provider factory cannot generate providers without a key
at org.apache.nifi.properties.AESSensitivePropertyProviderFactory.getProvider(AESSensitivePropertyProviderFactory.java:40)
at org.apache.nifi.properties.NiFiPropertiesLoader.getSensitivePropertyProvider(NiFiPropertiesLoader.java:190)
at org.apache.nifi.properties.NiFiPropertiesLoader.load(NiFiPropertiesLoader.java:249)
at org.apache.nifi.properties.NiFiPropertiesLoader.load(NiFiPropertiesLoader.java:266)
at org.apache.nifi.properties.NiFiPropertiesLoader.loadDefault(NiFiPropertiesLoader.java:173)
at org.apache.nifi.properties.NiFiPropertiesLoader.get(NiFiPropertiesLoader.java:284)

Could anyone please help?

[#2 · Accepted solution]

@Splash 

The problem you are facing is well known with nifi "There was an issue decrypting protected properties" It seems you can't decrypt the password in the nifi.properties  have a look at this link nifi .properties especially read carefully  3. Setting-up/Migrating encryption key you might need to run encrypt-config.sh script 

Please let me know if you need more help

[#3]

Ok. WIll do. Thank you!