Server configuration failure

I have successfully configured my server using user with ROLE_SYNCHRONIZE_TABLES
when sync tablet and the server I get the attached error message
What is the next step

There may be some issue where you have to change the login settings in services or to restart services. There is some discussion of this error and solutions here: ODK2 Sync Endpoint: Authentication error

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In addition to Caroline’s answer, this might also be caused by a 0-byte sized file - so it might be worth checking if you have an empty file somewhere in your application folder (e.g. an empty .js-, .html- or .css-file)

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