We recently had a client install a new AT&T Fiber line for Internet access.  After the line was installed, it didn't work properly.  AT&T did some troubleshooting and said the line was OK.  I performed some troubleshooting and noticed that one of the DNS servers that AT&T provided was randomly timing out during a simple ping test. 

I changed the DNS fowarders on the client's DNS servers to (AT&T), (uu.net) and (uu.net).  After this change the Internet connection was fast and stable. 

If your environment is configured to use as a DNS Server and you're having problems reaching sites on the Internet, consider removing this DNS server from your configuration and use a different ISP's DNS server.


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