When I set the password (another then "admin"), through the gui installer, it is only applied for the jmx-console. The web-console has the standard "admin" password.

In other words, the gui installer sets the password in:

jboss-as/server/default/conf/props/jmx-console-users.properties
jboss-as/server/all/conf/props/jmx-console-users.properties
jboss-as/server/production/conf/props/jmx-console-users.properties

but does not change the default "admin" paswd in:

jboss-as/server/default/deploy/management/console-mgr.sar/web-console.war/WEB-INF/classes/web-console-users.properties
jboss-as/server/all/deploy/management/console-mgr.sar/web-console.war/WEB-INF/classes/web-console-users.properties
jboss-as/server/production/deploy/management/console-mgr.sar/web-console.war/WEB-INF/classes/web-console-users.properties