In Touch with Dynamics (GP) takes a look at some issues they’ve had with Dynamics GP 2010 web services and Business Portal 5 installations along with information on how to fix the issues.
Dynamics GP 2010 web services and Business Portal 5 installation
Install, Upgrade & AdminDevelopment & IntegrationGP 2010
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.