Network protected by WEP

Hi all!
I'm new to the Archlinux forum. I have a problem with my wireless network: I can't access to it with the wep authentication activated. If I switch off the authentication there aren't problem...
For wireless connections I use network manager and I tried wicd with same results.
I tried to start network manager from terminal and, during the connection attempt, I saw this message:
While connecting to session manager:
Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed.
Before Archlinux I used Ubuntu 7.04 and 7.10 and I have never had problems with wireless connections.
What can I do?
Thanks!

On internet I discovered that this message isn't important for wireless connection... It is caused by other events (it seems to be by the kernel).
Today I noticed another message:
:: Casa up [BUSY] Error for wireless request "Set Encode" (8B2A) :
SET failed on device wlan0 ; Invalid argument.
- Could not set wireless configuration [FAIL]
I tried netcfg without positive results and this is the error message. I tried network manager with WPA too, but I can't access my wireless network.
What do you think? It seems to be that Archlinux can't use encryption with my wireless usb pen. I use ndiswrapper for drivers and under Ubuntu I hadn't problems...

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    Message was edited by: Robbie1702
    Message was edited by: Robbie1702

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    bump
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    Ashley Aitken
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    mrhatken at mac dot com email

    Hi BDAqua,
    Thanks for your post. Unfortunately, I don't believe I explained things clearly. I am trying to do IP routing from one machine to the other without using the NAT that Internet Sharing would give me.
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    18:46:43.826657 arp who-has 192.168.49.7 tell 192.168.49.4
    18:46:44.949274 arp who-has 192.168.49.7 tell 192.168.49.4
    18:46:45.950094 arp who-has 192.168.49.7 tell 192.168.49.4
    18:46:47.074291 arp who-has 192.168.49.7 tell 192.168.49.4
    18:46:48.075014 arp who-has 192.168.49.7 tell 192.168.49.4
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    18:46:59.448638 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 129
    18:47:02.463678 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 94
    18:47:03.528851 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 146
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    System preferences shows both machines are connected to the "Computer-to-Computer" network W.
    Pinging the other machine from either side I get:
    ping: sendto: Host is down
    ping: sendto: Host is down
    ping: sendto: Host is down
    ping: sendto: Host is down
    ping: sendto: Host is down
    ping: sendto: Host is down
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