The Database Server Manager typically displays QuickBooks Error 6175 when it is unable to launch or access the company file in multi-user mode.  Misconfigured server settings, firewall restrictions, or problems with hosting services could be the cause.  Changing hosting settings, restarting services, and making sure that servers are communicating properly are all necessary to fix the error.  For knowledgeable QuickBooks assistance and support, give 1.855.738.2784 a call.