10
It started working after adding the below to repo specific hgrc file
[hostfingerprints]
bitbucket.org = 24:9c:45:8b:9c:aa:ba:55:4e:01:6d:58:ff:e4:28:7d:2a:14:ae:3b
based on the suggestion here
certificate was changed on jan 19, 2012
Bitbucket’s SSL certificates are changing on March 6, 2014