Jira Server Multiple Errors - Can't access user group page, Can't Edit user, Can't create Project

[Oracle]

After installing Jira Software behind an NGINX proxy server using the Linux bin installer and configuring the Database, Jira has multiple issues:

• Can't access User Groups page (secure/admin/user/ViewGroup.jspa) - Give 500 Server Error. From the logs we have:

2020-04-25 22:33:28,548+0000 http-nio-8080-exec-16 ERROR [o.a.c.c.C.[.[localhost].[/].[action]] Servlet.service() for servlet [action] in context with path [] threw exception [java.lang.NullPointerException: name argument cannot be null] with root cause
java.lang.NullPointerException: name argument cannot be null
at org.apache.commons.lang3.Validate.notNull(Validate.java:225)
at com.atlassian.crowd.directory.AbstractInternalDirectory.findGroupByName(AbstractInternalDirectory.java:680)
at com.atlassian.crowd.directory.AbstractInternalDirectory.findGroupByName(AbstractInternalDirectory.java:62)
at com.atlassian.crowd.manager.directory.DirectoryManagerGeneric.findGroupByName(DirectoryManagerGeneric.java:452)
at com.atlassian.crowd.manager.application.ApplicationServiceGeneric.findGroupByName(ApplicationServiceGeneric.java:739)
at com.atlassian.crowd.embedded.core.CrowdServiceImpl.getGroup(CrowdServiceImpl.java:135)
at com.atlassian.jira.web.action.admin.user.ViewGroup.execute(ViewGroup.java:55)
... 7 filtered 

• Can't Edit user (secure/admin/user/UserBrowser.jspa) - Modal throws error:

java.lang.NullPointerException
	at com.atlassian.jira.web.action.user.GenericEditProfile.doDefault(GenericEditProfile.java:28) [classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [?:1.8.0_202]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [?:1.8.0_202]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [?:1.8.0_202]
	at java.lang.reflect.Method.invoke(Method.java:498) [?:1.8.0_202]
	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70) [webwork-1.4-atlassian-30.jar:?]
	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56) [webwork-1.4-atlassian-30.jar:?]
	at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:438) [webwork-1.4-atlassian-30.jar:?]
	at webwork.action.ActionSupport.execute(ActionSupport.java:157) [webwork-1.4-atlassian-30.jar:?]
	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:63) [jira-api-8.8.1.jar:?]
	at webwork.interceptor.De

• Can't create projects. It throws this error even after ensuring that the key name is all uppercase. E.g PROJ

Project keys must start with an uppercase letter, followed by one or more uppercase alphanumeric characters.

[Oracle · Accepted solution]

Figured it was because of the Nginx proxy server running on top of Jira. A thorough reading of these 2 articles related to running Jira behind a proxy server helped.

https://confluence.atlassian.com/adminjiraserver073/running-jira-applications-over-ssl-or-https-861253906.html

https://confluence.atlassian.com/jirakb/configure-jira-server-to-run-behind-a-nginx-reverse-proxy-426115340.html