During each UPDATE of a .DE domain DENIC first checks the nameserver settings. If the settings are not correct a ''Nameserver error'' occurs and the update fails (UPDATE FAILED).
You can use the DENIC test tool ''NAST'' to check the nameserver entries for .DE domains. With it you can identify challenges of the nameserver and settings.
Click here to got to the test tool ''NAST''
Once the nameserver entries are correct and the " NAST " tool displays no errors, perfom again the Action ''Update'' via the menu option ''Domain list'' in your personal customer account.