An error is observed in the error.log that reports "java.io.IOException: Permission denied" and the stack trace has "java.io.File.createTempFile" in it.
01.06.2017 16:34:02.631 *ERROR* [qtp1085110594-4453] org.apache.felix.http.jetty Exception while processing request to /system/console/configMgr/com.adobe.cq.experiencelog.impl.ExperienceLogConfigServlet (java.io.IOException: Permission denied) java.io.IOException: Permission denied at java.io.UnixFileSystem.createFileExclusively(Native Method) at java.io.File.createTempFile(File.java:2024) at org.apache.felix.cm.file.FilePersistenceManager._store(FilePersistenceManager.java:699) at org.apache.felix.cm.file.FilePersistenceManager.store(FilePersistenceManager.java:660) at org.apache.felix.cm.impl.CachingPersistenceManagerProxy.store(CachingPersistenceManagerProxy.java:242) at org.apache.felix.cm.impl.ConfigurationImpl.storeNewConfiguration(ConfigurationImpl.java:462) at org.apache.felix.cm.impl.ConfigurationImpl.<init>(ConfigurationImpl.java:183)
The user that owns the AEM java process doesn't have proper permissions to write in the java process' temp directory.