How to fix Quickbooks Error H202? Are you in trouble due to error H202 in your QuickBooks and not being able to switch to multi-user mode? This error can appear when your QB has some bugs in the company file your server is not connected to QB, etc. When you are stuck in trouble due to QuickBooks error H202 and need help to resolve the issue, you must try the given steps for troubleshooting. Fixing QB issue within a certain time is very important because errors in QB can hamper your work flow lead to loss in business or it may impact the business growth. There are some reasons which can trigger such issues which you must check. When you will know the reasons troubleshooting would be easier. Common cause of error H202: When there is an incorrect hosting setting on the server. Firewall setting that is blocking the communication. Improper DNS settings. Damaged or corrupted company files. Issue with Network configuration QB database server manager is not running. Methods to fix ...