Hi, I have the same problem (but I don’t know if the system upgrade is the cause in my case, as I did this already 6 days ago and Seafile worked until I upgraded it).
Yesterday, I upgraded Seafile from 5.1.8 to 6.2.7 and it worked fine for some hours. I could access all files and change settings via seahub. Then I rebooted my server, since then I get exactly the same error messages as you, “Local peer down” in ccnet.log, “could not bind socket” in seafile.log and those django errors (those seem to be a consequence of the could not bind socket error, see https://github.com/haiwen/ccnet/issues/107#issuecomment-213947818).
Have you been able to solve this yet?