I'm not sure why the PPTP clients are not able to access the inside resources. We'll need to capture the traffic to get that information but if you want to Cisco VPN client, then you can configure the following commands on the CLI, and it should work :
access-list split permit ip 192.168.1.0 255.255.255.0 any
no access-list inside_outbound_nat0_acl
access-list nonat permit ip 192.168.1.0 255.255.255.0 192.168.10.0 255.255.255.0
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...