Power up the item(s) in step 3 in reverse order - Modem ,Routher, Access Point - waiting until each device is completely rebooted and back "in the green." (typically between one and two minutes per device).
Wait at least two (2) full minutes! on the wall clock.
(these three devices are frequently one box, especially from a Cable TV or FIOS provider)
Power OFF as appropriate (unplug the power cord if you can't find a switch):.
Un-check the box to "Reopen windows when logging back in" (With a MacBook Air or PowerBook DO NOT just close the lid, shut it down completely and do not leave any programs running!) Shut Down your system (not reboot or sleep)!
The first step to fixing most of these communications issues is to get "new addresses and routes" (ARP and DHCP).
The Mac Client Communication Notes General Communications issues Many problems seen with both the Mac and PC Clients are truly caused by "Communications issues." The nature of the Internet and the encrypted UDP (see next section) used by LOTRO and DDO cause untold "non-obvious" problems.
Happy Cloud Installation - a description of the Happy Cloud Installer obsolete.
Steam Installation - Steam Installation notes.
Instructions for moving the Splash Screens.
Gatekeeper Information - Screenshots of Apple's Gatekeeper control panels and instructions.
Known Issues - A compilation of known problems with the Mac client.
Messages - Screenshots of various messages generated by the Mac Client and an attempt to intuit their meanings and explain them.
File Locations - Where files reside and where you need to put things like Plugins, Skins and Music files.
Problem resolution information! General Trouble Shooting Techniques.
Problem resolution information! Mac Client Communications notes - Port Forwarding, UDP and other notes.
The information is split to improve readability. With the release of the LOTRO Mac Client (Beta Version) there are many overlapping areas of information between First time users and on-going activities.
1.5 Communication with the server has been lost.
1.4 Communication related Knowledge Base articles.
1.3 The Mac Client and anti-malware (anti-virus) software.
1.2 The Mac Client and Firewalls (Port Forwarding).