The ioSafe R4 failed to authenticate with the domain controller. What should I do?

In most cases, this comes down to a DNS problem. You'll need to make sure that the ioSafe R4 is configured to resolve DNS from a properly configured DNS server. The easiest way is to run the DNS service on the domain controller.

For NT4-style domains, make sure you are joining using an account with proper credentials for joining the domain. More.

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