linksys firmware upgrades can be tricky--check the comments on the upgrades at sites like this http://www.versiontracker.com/mp/new...&search=router

You can connect through many different ports--6346 is just the default, and second most popular looks to be 6348. I've even seen people use five digit ports.

As long as the router, firewall and preferences are set to your preferred port, the set-up should be OK.