Unable to establish PPP link during connection to PPTP serve

Hello

I have a MikroTik 6.12 box on which I have setup PPTP and L2TP server. I can connect to L2TP server from my windows PC without any problem. But when I try to connect to PPTP server, it keeps hanging a long time in username/password verification step and then gives error 734" PPP link control protocol was terminated’.

Please guide me to fix this issue.
TIA

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