There is no protocol as "mm://" for making a admin connection. The admin connection as you know is managed totally by JBoss EAP. This label has caused confusion in terms of how Teiid uses the admin connection. This is how Teiid may have used 7.x series, but not in 8.x series. I believe I saw this one another place, may be on Teiid Connection Instance page. This needs to be corrected.