[pptp-server] Can't locate module block-major-3

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Hi, 

in a pptp vpn connection between a poptop server and a pptp linux router 
client i often find out in my logs this messages, repeated many times: 

Can't locate module block-major-3 

Here i post my conf.modules: 


alias scsi_hostadapter aic7xxx
alias eth0 eepro100
alias parport_lowlevel parport_pc 

alias char-major-108 off
alias ppp-compress-18 ppp_mppe
alias ppp-compress-21 bsd_comp
alias ppp-compress-24 ppp_deflate
alias ppp-compress-26 ppp_deflate 


Furthermore, i would like to ask you why sometimes the vpn connection fails 
and, this is THE BIG problem, on the server side the ppp0 interface goes 
down BUT by typing ps -ax i can see the pppd connection process still 
active! If i don't kill the pppd connection the client cannot reconnect. 

Thank you in advance for your kind interest, best regards! 

Francesco