moodle-1.9.16 is installed on moodleA and moodleB. They are on the same box. MNet was configured and working correctly. Did a restore of all of the courses on moodleB from a MySql dump file. Now the certs are out of sync.. So no problem just delete the host on MoodleA and recreate.
Get the error as mentioned in http://moodle.org/mod/forum/discuss.php?d=194820#p849182. Thanks David for a work around.
Is there another way to re-sync the certificates between the 2 servers? Either at the file or database level?
I see some cert stuff in the database but this would be a last resort for me.
I resorted to doing the restore before configuring MNet but a back door to re-syncing the certs would have made my day a lot better.