Regression test We need to make sure XMPPHP still works as expected after the upgrade. As the admin user, run the local jabber server ( https://hub.docker.com/r/rroemhild/ejabberd ) configured with 2 users, and no TLS. docker run --name "ejabberd" \ -p 5222 : 5222 \ -p 5269 : 5269 \ -p 5280 : 5280 \ -h 'xmpp.localhost' \ -e "XMPP_DOMAIN=localhost" \ -e "EJABBERD_ADMINS=admin@localhost admin2@localhost" \ -e "EJABBERD_USERS=admin@localhost:password1234 admin2@localhost:password4321" \ -e "TZ=Europe/Berlin" \ -e "EJABBERD_STARTTLS=false" rroemhild/ejabberd In Moodle, enable Jabber and configure the server details. Set: host: 'localhost' Jabber server: NOT SET Username: admin Password: password1234. Via 'Default notification preferences' (Site administration > Messaging > Notification settings) enable Jabber for offline AND online use for the 'Personal messages between users' row. Make sure the select is set to 'Permitted'. Create a course and enrol 2 students, student 1 and student 2. Log out. Log in as student 1. Click the notifications bell, and selected preferences (the cog). Click the cog next to Jabber int he column header. Enter 'admin2@localhost' and hit enter to link that user to student 1 Open messaging pane and click the cog Enable Jabber output (toggle to on) but leave the Email (and any other outputs, if available) disabled (we don't want these to interfere for now) Log out. Download pidgin (sudo apt-get install pidgin) Open pidgin and set up student 1's linked jabber account: Basic tab Username: admin2 Domain: localhost Password: password4321 Advanced tab Connection security: Use encryption if available Proxy tab Proxy: No proxy Leave Pidgin open Now, log in to moodle as student 2 Open messaging, search for student 1 and send them a message. Verify the message is sent in Moodle's UI without any error/debug popups Verify you get a message in Pidgin with the message details.