why this happens to me

[michael19284]

Exploit failed [disconnected]: Errno::ECONNRESET Connection reset by peer - SSL_connect

[zecopro]

@michael19284 try on this command set GROOMSIZE 50 and then exploit

[zablah]

@zecopro set GROOMSIZE 50 make windows 7 virtual box crash
how I can calculate the GROOMSIZE ?
I tried multi value of GROOMSIZE like [1,7,15,30,..] and all this values make my guest crash