After installed the Airlink101 wireless-N adapter firmware, Lotus Sametime failed to connect. Solution: uninstall the AT&T VPN and reinstall it. Note that sametime connects well through wired connection. Not sure the exact cause, but it seems to relate with the MTU setting according to this (http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/Lotus_SmartSuite/Lotus_Notes/Q_24087444.html):
http://members.tripod.com/~EasyMTU/easymtu/index.html
If you are using Internet Connection Sharing (ICS) and the outbound connection uses PPP over Ethernet
(PPPoE), the clients that are using the ICS connection may not be able to browse some Web sites or send
e-mail messages that contain attachments.
PPPoE requires lowering the Maximum Transmission Unit (MTU) setting on all client computers to a value no
larger than 1,492. (The default is 1,500.) In some cases, a value less than 1,492 may be necessary.
In order to determine the proper MTU size, perform the following steps:
1.Determine the default gateway of the ICS server using IPCONFIG.
2.From a command prompt on a client, type PING -f -l <MTU size> <IP address of default gateway from
first step>. Start with an MTU size of 1,454.
3.If this fails with an error message indicating that it must be fragmented, decrease the MTU size and try
again. Repeat this until the ping command succeeds.
Not convincing to me.