I have a client with an Internet issue when using Yahoo mail. This is a sbcglobal account. When they try to log on, the system will come back with a message that cprodmasx.att.com took too long to respond. This happens on all computers on their network in the office. It happens in all browsers. It happens with the AV installed or uninstalled. It does not happen when a computer is directly connect to the Comcast modem/router.
I'm not sure where to look for the answer to this problem. All of the other websites respond properly. I can get to gmail without a problem. There seems to be no other sites giving them issues. The mail does come through using Thunderbird as an email client. Unfortunately, they like the web interface and not the email clients like Thunderbird or Outlook. (Sigh...).
The email is accessible without a problem from anywhere offsite so it's not a site problem but something within the system. The only thing that I can think of is the hardware in the middle, the 24 port switch. It's an unmanaged switch so there's not a lot that can go wrong. Does this make sense to any of you? Is there something else that I might be missing (may with DNS or something else I'm not thinking of?)
If I do a traceroute, it get to a certain point out on the web (well outside of the local network) and then just keeps timing out. Traceroute to att.net resolves to the ip address properly.
I'd appreciate anyone's input on this one.