samba - May 2014 - windows share : retransmission and time out of Trans2 Request, FIND_FIRST2

OS- windows vista 32-bits

Control Panel -> Network & Sharing center
Network discovery ON
File Sharing ON
Public folders Sharing ON
Password protected sharing ON
Media Sharing ON

Window firewall turned OFF
McAffee firewall turned OFF

Case 1: Connect to LAN using wireless connection (network type= private)
I can open the windows share, look at the list of shared folders & open
them.

Case 2: Switch from Wireless to Wired LAN connection (network type= private)
I can open the windows share, look at the list of shared folders. But can* NOT
open any shared folder*. The open request times out on the client.

All I am doing is change from Wireless to Wired connection. Everything else
is equal. I want to switch to wireless to improve file transfer speeds.

Here is a network trace from wireshark. I keep seeing re-transmissions for
the packet highlighted below. Eventually the request times out at the
client end.

139 23.780789000 192.168.1.2 192.168.1.4 SMB 160 Tree Connect AndX Request,
Path: \\192.168.1.4\USERS
140 23.781413000 192.168.1.4 192.168.1.2 SMB 124 Tree Connect AndX Response
141 23.787286000 192.168.1.2 192.168.1.4 SMB 154 Trans2 Request,
FIND_FIRST2, Pattern: \*
144 23.988441000 192.168.1.2 192.168.1.4 SMB 154 *[TCP Retransmission]
Trans2 Request, FIND_FIRST2, Pattern: \**
145 24.073991000 192.168.1.4 192.168.1.2 SMB 124 [TCP Retransmission] Tree
Connect AndX Response