is it against the rules to vend in fields dungeons or other towns ( other than prontera )
It's fine to vend in other towns. Why would you vend in a field?
The rules state that it's not allowed to autotrade in a map with monsters (the 1 wild rose in town doesn't count).
well..have one of my venders sit in ein field where geos are vending arrow quivvers, pots, fwings, bwings , ect
so it is legal to vend in ein right at the portal? ( off the path of course )
In the city near the portal (off the path) yes, in the field no.