On the Remote Access > PPTP > Advanced tab you can configure the encryption strength and the amount of debug output with regard to PPTPPoint to Point Tunneling Protocol remote access. Note that advanced PPTP options can only be configured if PPTP remote access status is enabled on the Global tab.
You can choose between strong (128-bit) and weak (40-bit) tunnel encryption (MPPEMicrosoft Point-to-Point Encryption). Do not use weak encryption unless you have endpoints that do not support 128-bit encryption.
Enable debug mode: This option controls how much debug output is generated in the PPTP log. Select this option if you encounter connection problems and need detailed information about the negotiation of client parameters, for example.