Also make sure UPnP is enabled on the Actiontec, otherwise that may be the cause of the firewall (if not your osx firewall.)
If possible, free up space on the system drive. With OSX 10.4 you can move "some" programs to other drives without problems. All applications including the system use VM (Virtual Memory), & LW uses a lot of VM. VM = uses HDD space to temporarily store memory. |