2 users can't connect simultaneously from same office

[francisco del cura ferreira]

Hi all:

As the topic says, we have 2 teleworkers inside a office bank. The scenario is always the same, only 1 of them can connect and as long as he is connected, his partner is unable to connect. If the first worker disconnect the VPN tunnel, the second one can bring the tunnel up (but the first worker no longer connect). The rest of the users inside same public IP (myself and my partners) could connect with no problem.

One is using Vista 32 bits and 5,0.07.0410 Cisco VPN Client version and the other one Vista 64 bits and 5,0.07.0440.

NAT-T is enabled globally on ASA (5520 - 8.2(2)).

In the fail attempt I saw the next message:

72     11:43:34.795  10/21/13  Sev=Warning/3          CVPND/0xA340000D

The virtual adapter was not recognized by the operating system.

73     11:43:34.795  10/21/13  Sev=Warning/2          CM/0xE310000A

The virtual adapter failed to enable

I looked for many workarounds for this error, but any of them worked. Keep in mind the second person can connect when the other is not connected to VPN tunnel, so I don't think the problem is laptop related.

Any idea about what's going on?.

Thanks!

[francisco del cura ferreira]

Problem fixed through the command you can see here:

http://www.cisco.com/en/US/docs/security/vpn_client/cisco_vpn_client/vpn_client500_501/release/notes/51client.html#wp1584552

If this procedure does not work, run the following command from cmd:

reg add HKLM\System\CurrentControlSet\Services\Tcpip\Parameters /v ArpRetryCount /t REG_DWORD /d 0 /f

Then reboot.

Hope this help other people with the same problem.

Regards