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Errors on setting up a Watchguard XTM 21 to work with Dynamic DNS

I am setting up a Watchguard XTM 21 to work with Dynamic DNS.
After entering Dynamic DNS configuration into the router.
Hit Ok
Internal error code 500
Internal server error occured please login again
Try to login again
Error code 409
Have to wait until it times out.
Any suggestions on how to get past this error code 500?
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2 Solutions
Try using a different web broswer; also please have a look at article below to ensure that the steps are correct:

Please check and update.

Thank you.
milwjwhAuthor Commented:
Found a different port number in second set of instructions. Used this and no longer encountered the problem.
milwjwhAuthor Commented:
milwjwhAuthor Commented:
Advice helped me solve the problem.
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