A potentially dangerous Request.Path value was detected from the client

Hey nopCommerce community,

We found this in log records.  How dangerous is this?

Thanks

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View log entry details (back to system log)  
Log type:  Unknown  
Severity:  11  
Message:  A potentially dangerous Request.Path value was detected from the client (:).  
Exception:  System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the  client (:). at System.Web.HttpRequest.ValidateInputIfRequiredByConfig() at System.Web.HttpApplication.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)  
IP address:  62.193.226.(196-OneNineSix)  
Customer:  
Page URL:  http://64.27.49.(135-OneThreeFive)/w00tw00t.at.blackhats.romanian.anti-sec:)  
Referrer:  
Created on:  12/4/2010 5:07:31 PM  
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I looked up the IP address you stated and it came from France. Do you live in France? If so, it was probably someone who created an error in the application. Probably nothing to worry about. Nowadays, to hack a server, it takes a lot of money power. You would have to be a high-profile website for someone with enough resources to try and hack your website.

If you are a high-profile website, it is best to hire full-time security staff to monitor your system.