i just called havneweb support and talked to one Ivar from there, he seemed very knowledgable and explained how to set up the connectivity between havneweb and eaccounting.
The password is stored in cache in the browser, so if you recently changed password, havneweb will try to use the stored value from cache and fail.
So what you have to do is delete cache/cookies etc., the go to havneweb and set up the integration:
Grunninstillinger > Visma integrasjon > koble til visma
And it should work! 😃
This post is based on what i understood, there could be something that i missunderstood or that will be changed in time, if that is the case, do not hesitate to call havneweb support.