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Chapter 8.5. Remote Access Service (RAS) > Troubleshooting Dial-up Connections

Troubleshooting Dial-up Connections

First, be sure the computer hardware is functional, cabling is connected, and WAN links are up. Slow WAN links used by connections that require strong encryption can slow transmissions and cause timeout errors or erroneous messages such as Domain Controller could not be found. Check the throughput of the connection using modem diagnostics utilities or client dial-up software.

After confirming that issues are not hardware-related, proceed up the OSI model and eliminate one layer at a time. Given the complexity of RAS and the various architectures and technologies that it uses, it is easy to spend a lot of time chasing down the wrong path because an immediate first impression clouds logical deduction. Do not underestimate the benefit of using basic scientific troubleshooting methodology. Comparison with the OSI helps to isolate the source of the problem, not the symptom; and it forces you to look at the whole picture, rather than focusing in on immediate first impressions. Furthermore, generic error messages can often mask the true source of a problem because assumptions about the cause of the error messages are made.


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