AOL IMAP mail service down, blocked by AOL's net server

We have not had any email from AOL in our IMAP account for several days. 

I ran traceroute imap.aol.com, and got a good route upt to this:

13  edge1-dtc-ae0.net.aol.com (149.174.32.6)  93.641 ms  89.369 ms  88.004 ms

14  * * *

meaning that my network route is fine up to the "edge" servers in AOL's internal domain, then no further forwarding is provided.