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https://coderanch.com/t/555293/application-servers/Unable-login-manager-GUI
https://serverfault.com/questions/342312/tomcat-not-accepting-username-password-for-manager-gui
https://tomcat.apache.org/tomcat-8.0-doc/manager-howto.html
https://community.alfresco.com/thread/177179-unable-to-access-tomcat-manager
http://tomcat.10.x6.nabble.com/Can-t-login-to-Tomcat-manager-pages-td2028595.html
https://connect.boundlessgeo.com/docs/suite/4.5/sysadmin/manager/index.html
https://www.mkyong.com/tomcat/tomcat-default-administrator-password/