i have problem to connect with Public IM provider (yahoo & MSN) and getting below message. any help will be appriciated.
When contacting your support team, reference error ID 504 (source ID 239).
Troubleshooting information is available online, including best practices for using Lync.
i have enabled Federation Route to your Edge server in the properties of your site in Topology Builder and enabled users for federation also able to telnet on 5061.