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Cisco VPN Client: Reason 429: Unable to resolve server address

Most laptops can connect to our VPN, but my personal Dell laptop cannot due to the following error that occurs almost immediately after clicking Connect button on the Cisco VPN Client - Version 5.0.02.0090:

Secure VPN Connection terminated locally by the Client.
Reason 429: Unable to resolve server address.

Some folks said to un-check Properties>Transport>Enable Transparent Tunneling but it seemed to have no effect.

The laptop can connect to the internet and all protocols work: HTTP, EMail, FTP, etc.
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MikeKane
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Orkest29

This is a random thing that was happening to my clients. there were trying to use VPN while already on a site that had wifi that was connected to out domain so it was giving them the error because they didnt need it already
What if my company blocked the access by using IP address. Is there any work aroun , other settings I can check.