403 error on facebook

I just migrated my shared cpanel account to my vps cwp pro account
I have a WP to FB autoposter plugin that now gets a 403 error on the FB post on the image request from my migrated site
I understand that this is a mod-secuity rules issue
Is there an easyway do disable the rule for facebook
Where is it and how do I disable it?

Thanks

check the modsecurity log to find out the rule number that is causing the issue.  Then put an exemption into modsecurity.