Checked logs, its throttling all connections - why is this? Did the upgrade mess with the throttling settings?
2009-05-13 13:02:52.293 [NOTICE] [10.55.55.2] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:02:55.446 [NOTICE] [72.89.128.26] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:03:09.729 [NOTICE] [38.100.42.51] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:03:12.765 [NOTICE] [66.249.71.132] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:03:38.289 [NOTICE] [66.249.71.138] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:03:50.087 [NOTICE] [74.63.197.202] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:04:15.697 [NOTICE] [81.111.138.223] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:04:17.853 [NOTICE] [216.129.119.12] Reached per client connection hard limit: -1, close connection!
2009-05-13 13:05:23.084 [NOTICE] [85.249.223.22] Reached per client connection hard limit: -1, close connection!