mschap2 with encryption problem

[Edgars]

i have problems when using PPTP connection (mschap2 with encryption). 
Are there any special setting to set in clients.conf file because the 
user side can't connect to the NAS? With PAP everythinh works perfectly. 
Currently in client.conf i have the following:

client 10.5.8.103 {
       secret = xxx
       shortname = pptp_test
}
What should i add here to make mshap2 with ancryption to work?
Thank you anyway!
Edgars
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