Oracle 11g Enterprise Manager Login Fail Internal Error has Occured I have installed Oracle 11g on my Windows 10 machine. I followed all preinstallation requirements.

When trying to log in to the Enterprise manager via this link:



https://localhost:1158/em


I get the error:


  Internal Error has occurred. Check the log file for details.


I have found log files and it looks like this is the relevant entry:

2017-09-17 07:36:53,631 [MetricCollector:HOMETAB_THREAD600:60] ERROR rt.DbMetricCollectorTarget _getAllData.344 - java.lang.NullPointerException
java.lang.NullPointerException
    at oracle.sysman.emSDK.emd.comm.EMDClient.getURL(EMDClient.java:1570)
    at oracle.sysman.emSDK.emd.comm.EMDClient.getConnection(EMDClient.java:1266)
    at oracle.sysman.emSDK.emd.comm.EMDClient.getConnection(EMDClient.java:1242)
    at oracle.sysman.emSDK.emd.comm.EMDClient.getResponseForRequest(EMDClient.java:1689)
    at oracle.sysman.emSDK.emd.comm.EMDClient.getMetrics(EMDClient.java:981)
    at oracle.sysman.emo.perf.metric.rt.DbHomeTab._getAllData(DbHomeTab.java:340)
    at oracle.sysman.emo.perf.metric.rt.DbHomeTab.getData(DbHomeTab.java:154)
    at oracle.sysman.emo.perf.metric.eng.MetricCached.collectCachedData(MetricCached.java:416)
    at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread._collectCachedData(MetricCollectorThread.java:605)
    at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread.run(MetricCollectorThread.java:325)
    at java.lang.Thread.run(Thread.java:595)


I have tried to set the unique name in environment variables, I thought maybe Java was the problem so I updated my JDK to 8. I am still getting the same error, and my SQL Plus will not open, as soon as I put in the correct credentials it closes. Also I have configured a Listener and tested, test was successful.

Please help.
I managed to fix the issue, turns out it was a time zone issue. The DB time zone and computer time zone were different. Thus the DB Console would not start and was giving the error "EM daemon is not running".
I fixed it by following instructions here.

Also note before I did that I completely uninstalled Oracle and reinstalled it. There were some issues on that install that were causing SQL not to run. But the above is what fixed the Internal Error I was getting as I got it again even after the fresh install.