If you search why your rules are applied by PPTP VPN sessions are not albe to established with an error 619 (on windows plateform) :

ASA# conf t
ASA(config)# policy-map global_policy
ASA(config)# (config-pmap)# class inspection_default
ASA(config)# inspect pptp
ASA(config)#

and :

ASA(config)# access-list outbound extended permit gre any any
ASA(config)# access-list outbound extended permit tcp any any eq pptp
ASA(config)# access-group outbound in interface inside

Have fun 🙂