Did you set the port forward correctly? It must be done in this order else it needs to be removed & repeated properly; (1) set up a static ip: Setting up a static ip, and then (2) Port Forwarding for the Linksys BEFSR41v2

Other than that that I can think of is ... disable all the performance options & OOB searching as described here under 4th & 5th paragraphs: If LW Will Not Connect (click on the blue link)

Keep in mind what I suggested in (1) in my previous post.