Explore this reference link

https://quickbooks.intuit.com/learn-support/en-us/access-data-remotely/how-to-fix-error-6175-0/00/20...

Next, open a dummy file or sample file to isolate the issue. If you can open any of them in muti-user mode, your data file may be damaged. Call and ask Intuit Data Service to fix it. Should you need to resolve in due course, consider purchasing a 3rd party file repair service.

Hope it helps.