Yesterday Yahoo moved their servers that provide IM federation for OCS & LCS. MSN also made a similiar change. I wish they would have notified the community at large in advance. I’ve received almost a dozen calls this morning from customers yelping that PIC is broken. Yes I realize that the recommended config is to allow “any” access to port 5061, but many customers like to lock it down to a select group of IPs. Here’s a the KB article on the Yahoo change and a rundown of the changes from the OCS Team Blog:
IP address that is used by MSN (Windows Live)
• 65.54.227.249 IP addresses that are used by Yahoo!
• 76.13.22.8
• 76.13.22.9
• 76.13.22.10
• 76.13.22.11
• 98.136.47.8
• 98.136.47.9
• 98.136.47.10
• 98.136.47.11
IP addresses that are used by AOL (unchanged)
• 64.12.162.248
• 205.188.153.55
