Thank you for your reply. The problem has been solved, sadly not by my efforts. There are cable modem connections at the locations and there were a few other issues that I wasn't aware of (one being issues with connecting to some our HQ servers from clients at the locations). My boss called the company and requested the modem be set to bridge mode. Everything works after the change. I am not sure if the modem has anything to do with the MTU, I don't think so, but I guess it's possible. It's also possible the modem had a security setting that was blocking our traffic. Again, thanks for your reply!
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