QB Issue Resolution:
http://www.qblittlesquare.com/2012/12/sharing-your-quickbooks-file-across-networks/ is one way.
The other way is to move the company file with you.
Resolution for Issue 'What is the best way to access my QB file from home?' available: Yes (Solved).
Source: Intuit Community forum.
What is the best way to access my QB file from home?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Quickbooks
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