A user can't get through

Maybe someone has an idea. I have one user of my site that is unable to connect to the site anymore. His browser gives him an error. Other people can see the site fine, and this user says he has no problem with any other sites besides mine.

What are the possibilities for what might be causing something like this? He checked his DNS and the IP is correct. Is it possible that my host (dot5) is blocking him unknowingly for security or something?

This happened to the same user one other time and it just sort of went away all by itself after about a week. This time it has been almost two weeks and it's not going away.

If anyone has any thoughts, I'm all ears!

 

 

 

 

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