We on the forums never know what posters mean by ” I have tried all the suggested solution.” Have you tried the steps in the article below?

http://support.quickbooks.intuit.com/support/Static/how12406.html

Resolution for '11118 issue: 'Error 3371, StatusCode 11118.' available: Yes.

The 11118 issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the 11118 issue yourself by looking for a resolution described in the article. If it is a complex 11118 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 11118 support options.

For more information about resolving issues related to 11118 in Quickbooks/QBO or to get support for the issue 'Error 3371, StatusCode 11118.', click the link below: