There is slight inconsistence in GUI installer on LDAP configuration screen.
User is able to fill in credentials that let him test LDAP connection with success but does not let him proceed to next page.

The fault state occurs when confirm password field is empty or doesn't match the password field.

Possible solution is that 'Test LDAP connection' button is disabled whenever both passwords don't match.
Or add the same validator as for proceeding to next page, ie. issue error dialog after clicking button, that passwords don't match.

Note: This issue is not a problem for console installer, because 'Test LDAP connection' choice comes after passwords are already filled in.