Trying to configure SPNEGO with IBM ELM 7, fails at kinit -k -t /etc/krb5.keytab HTTP/elm.corp.demo.com

https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_spnego_config.html

When I reach the step to verify with kinit from IBM:

PS C:\windows> C:\Users\victor\IBM\JazzTeamServer\server\jre\bin\kinit -k -t krb5.keytab HTTP/elm.corp.demo.com
java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key com.ibm.securit
y.jgss.i18n.exception.UnableLocRealm
PS C:\windows>


        

I have been googling around for this exception but I did not found additional information, so I've tried with kinit from OpenJDK 8 to get more info:

PS C:\windows> C:\Users\elmHttp\Downloads\openjdk-8u41-b04-windows-i586-14_jan_2020\java-se-8u41-ri\bin\kinit -k -t krb5
.keytab HTTP/elm.corp.koneksys.com
Exception: Connection refused: connect
java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at sun.security.krb5.internal.TCPClient.<init>(NetClient.java:63)
        at sun.security.krb5.internal.NetClient.getInstance(NetClient.java:43)
        at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:393)
        at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:364)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.security.krb5.KdcComm.send(KdcComm.java:348)
        at sun.security.krb5.KdcComm.sendIfPossible(KdcComm.java:253)
        at sun.security.krb5.KdcComm.send(KdcComm.java:229)
        at sun.security.krb5.KdcComm.send(KdcComm.java:200)
        at sun.security.krb5.KrbAsReqBuilder.send(KrbAsReqBuilder.java:316)
        at sun.security.krb5.KrbAsReqBuilder.action(KrbAsReqBuilder.java:361)
        at sun.security.krb5.internal.tools.Kinit.<init>(Kinit.java:219)
        at sun.security.krb5.internal.tools.Kinit.main(Kinit.java:113)
PS C:\windows>
        

I have just followed what the instructions say but it fails to connect. Does anyone knows how to solve this issue?

My krb5.ini file:

[libdefaults]
          default_realm = WINSERVER2016FO.CORP.DEMO.COM
          default_keytab_name = FILE:c:\Windows\krb5.keytab
          default_tkt_enctypes = rc4-hmac
          default_tgs_enctypes = rc4-hmac
          forwardable  = true
          renewable  = true
          noaddresses = true
          clockskew  = 300
          udp_preference_limit = 1
[realms]
          CORP.DEMO.COM = {
                kdc = winserver2016fo.corp.demo.com:88
                default_domain = corp.demo.com
         }
[domain_realm]
        corp.demo.com = CORP.DEMO.COM


        

And this is how I created the krb5.keytab file:

PS C:\Users\demouser> ktpass -out krb5.keytab -princ HTTP/elm.corp.demo.com@WINSERVER2016FO.CORP.DEMO.COM -m
apUser elmHttp -mapOp set -pass security -crypto RC4-HMAC-NT -ptype KRB5_NT_PRINCIPAL
Targeting domain controller: WinServer2016Fo.corp.demo.com
Using legacy password setting method
Successfully mapped HTTP/elm.corp.demo.com to elmHttp.
Key created.
Output keytab to krb5.keytab:
Keytab version: 0x502
keysize 95 HTTP/elm.corp.demo.com@WINSERVER2016FO.CORP.DEMO.COM ptype 1 (KRB5_NT_PRINCIPAL) vno 5 etype 0x17 (RC
4-HMAC) keylength 16 (0xd5e9e0db50ba46b948853221be26da2b)
PS C:\Users\demouser>


        

Product version: 

IBM ELM Version: 7.0.2

First test: IBM JDK: java version "1.8.0_191", IBM J9

Second test: OpenJDK 8, java version: 1.8u41

Active Directory OS: Windows Server 2016 at winserver2016fo.corp.demo.com

IBM ELM OS: Windows Server 2016 at elm.corp.demo.com

Thanks in advance!