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Diagnostic Tests

Some web servers control access to their sites by requiring that forward and reverse entries for the client computer are registered in the domain name service (DNS). A common further requirement is that the client computer be registered in an Argonne domain, thereby having a name ending with anl.gov. The tests on this page are designed to help us diagnose web site access problems in a systematic manner.

Your IP number is 54.197.74.137

Your host DNS name is ec2-54-197-74-137.compute-1.amazonaws.com

Frequently Encountered Problems

  • Computers with no dns entries cannot access either link 2a or 2b.
  • Computers with incorrect dns entries (forward or reverse) cannot access either link 2a or 2b.
  • Computers with domain names registered in dns that are different from the names configured in the computers cannot access either link 2a or 2b.
  • Computers with extra dns entries that are not active (would not respond to ping) cannot access either link 2a or 2b.

Additional Test Rules

  • All computers will reach a web page with either the 1a or 1b link regardless of the dns configuration.
  • All computers will reach a web page with either the 2a or 2b link but only if dns is properly configured.

1. Test your computer's IP number by choosing the a or b link:

a. Computers with an IP number in the Argonne IP space

b. Computers with an IP number NOT in the Argonne IP space

If you reach a web page with the a link, your computer is in the Argonne IP space. If you reach an error page, your computer is not in the Argonne IP space. Your result for link b will be the opposite of that for link a.

2. Test your DNS entry by choosing the a or b link:

a. Computers with domain names ending in anl.gov

b. Computers with domain names NOT ending in anl.gov


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