How can I config PPTP tunnel more secure?

How can I config PPTP tunnel more secure?

USe L2TP/IPSEC.

PPtP doesn’t use enough bits to be truly secure anymore.

Thanks, Now I using L2TP, I did it working fine for yesterday, but today is stupid no work Error 800

I know maybe Firewall allow error am not nothing to do change on router.

Before I tested the PPTP port is online but not no

Please help me

http://wiki.mikrotik.com/wiki/L2TP_%2B_IPSEC_between_Mikrotik_router_and_a_PC
http://wiki.mikrotik.com/wiki/MikroTik_RouterOS_and_Windows_XP_IPSec/L2TP

Here are a couple of guides for setting this up.
While getting started, I would make sure that the ip filter firewall rules are very loose - if you know what IP address your remote PC is coming from for VPN, just make a rule that allows all traffic from that IP. This removes the firewall from your list of things to worry about while getting the VPN set up. Once you set it up and it works, then you can tighten this up.

Using that method, if you break something while tightening the firewall rule - you know it’s the firewall rule and not because you forgot to enable sha1-hmac-blowfish-rot13 profile in your phase 2 proposal or something crazy like that.