Error occurred in deployment step 'Recycle IIS Application Pool': Cannot connect to the SharePoint site:

Error occurred in deployment step 'Recycle IIS Application Pool': Cannot connect to the SharePoint site: http://dev2:81/. Make sure that this is a valid URL and the SharePoint site is running on the local computer. If you moved this project to a new computer or if the URL of the SharePoint site has changed since you created the project, update the Site URL property of the project.

解决方案：

1. Added myself as the administrator

2. Added myself to SharePoint Farm Admin Group（网站权限--Farm Administrators 组新增用户）

3. Provided DB Owner access to SharePoint Content DB（为用户分配所有相关数据库的DBOWNER权限）