Lan Connexion

Hi,

I recently changed my router for an AC 750 one, which works great.  I also had to re-install windows 10 on 2 laptops and since then, one of them just refuses all lan connexion requests.  Yes, the option to accept lan connexions in turned on but I only can connect thru internet. I also had the router reserve the laptop's ip address so it could make it more convenient.  Any suggestions?

Thanks in advance.