L2TP connection failed

Hi, i have configured and working mikrotik, with L2TP server started.
And one problem… can’t connect to it from home (no any ip addressess blocked on mikrotik)
it write “phase 1 negotiation failed due to timeout”

if i connectiong from phone (3g internet) - all ok
other computers in other city - all ok

it can be problem if my home and mikrotik use same internet provider ? and why ?

sry, that error

phase1 negotiation failed due to time up Y.Y.Y.Y[500]<->X.X.X.X[500]