This can often be tricky because errors related to network issues are usually mentioned in a different code. If your software does not launch in the first place, Cannot Open QuickBooks Portable Company File then you may have problems with the program files related to your accounting software. In extremely rare cases, a separate process of the software may be running in the background. So instead of launching a new instance, windows may close the instance you opened because it believes that an instance of the program is already running.  To check for network errors, you can rely on the QuickBooks tool hub and scan your system for network issues. If any network related issue is found, then you’ll get more information about the same from the tool. You can then alter the network settings or get in touch with your internet service provider to get the issue resolved.