I am not able to accesss www.costco.com through spectrum internet. I was on the line with spectrum tech support for 30 minutes and he said that costco.com blocked my IP and problem is not on Spectrum's side.
I called costco tech support and they confirmed that they do not block any IP's and internet provider might be blocking tem.
You don't have permission to access "http://www.costco.com/" on this server.
Spectrum tech support person suggested to cancel my service if i don't like his suggestion.