We have had several instances of this message recently when users are attempting to connect to their wireless LAN in Microsoft Windows Vista: "Your network Administrator has blocked you from connecting to this network"
We have not yet found the cause of this. We will update this post when we do. Please add a comment if you have further informaion.
Well here is the important part, the fix. You can use the Network Services shell to unblock the restriction.
netsh wlan delete filter permission=denyall networktype=infrastructure
netsh wlan delete filter permission=denyall networktype=adhoc
You can find additional details on the netsh wlan command here. Here is an exerpt from the documentation relating to the netsh wlan delete filter.
Removes a wireless network from the wireless allowed or blocked list
Syntax:
delete filter permission={allow|block| denyall} ssid=WirelessNetworkNamenetworktype={ infrastructure|adhoc}
Parameters:
permission {allow | block | denyall}
Required. Specifies the permission type of the filter.
ssid
Required [conditional, see "Remarks"]. Specifies the SSID of the wireless network.
networktype {infrastructure | adhoc}
Required. Specifies whether the wireless network type is adhoc or infrastructure.
Remarks:
The ssid parameter is required, unless the value of the permission parameter is denyall. Then the ssid parameter should not be given.
Example commands: