When accessing the SEPM Web Console it hangs at "Initializing, please wait"

Products

• Endpoint Protection

Issue/Introduction

When attempting to access SEPM Web Console

Initializing, please wait
HTTP Request to https://IP Address:8843/console/apps/sepm?do hasn't gotten a response.
This is likely to cause issues with text sizing and display
Please make sure that your server configuration doesn't restrict HTTP requests to IP Address:8443:https://IP Address:8443:console/apps/sepm/?do.
For more information see out documentation

Environment

SEP Manager Version 14.3 RU2 14.3.4615.2000
Windows Server 2016 Server Datacenter Full Installation 64-bit
Database Microsoft SQL Server 2016

Cause

Ajaxswing log

17-May-2021 08:23:57.376 SEVERE [https-openssl-apr-0.0.0.0-8443-exec-6] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [AppRouter] in context with path [/console] threw exception [Filter execution threw an exception] with root cause
java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native
at com.symantec.sepm.ajaxswing.filter.ConsoleFilter.getAvailableMemory(ConsoleFilter.java:335)
at com.symantec.sepm.ajaxswing.filter.ConsoleFilter.isMemoryAvailable(ConsoleFilter.java:382)
at com.symantec.sepm.ajaxswing.filter.ConsoleFilter.doFilter(ConsoleFilter.java:227)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.symantec.sepm.ajaxswing.filter.CookieEnabledCheckFilter.doFilter(CookieEnabledCheckFilter.java:84)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)

Resolution

1. Go to SEPM server and STOP SEPM services, close SEPM UI if opened
2. Go to <SEPM_HOME>\tomcat\webapps\ajaxswing\WEB-INF\lib
3. Take backup on desktop for jna-4.2.2.jar and jna-platform-4.2.2.jar
4. Remove those from SEPM folder <SEPM_HOME>\tomcat\webapps\ajaxswing\WEB-INF\lib. Note: Keep latest one jna.jar and jna-platform.jar as it is 
5. START SEPM services