While trying to open a site in the sharepoint designer, you get the error
The server could not complete your request. Contact your internet service provider or Web server administrator to make sure that the server has the Frontpage Server Extensions or SharePoint Services installed
- Go to the application server
IIS -> Application pools -> select the corresponding application pool -> right click -> recycle the application pool.
- If you are still unable to get the page opened, try to open an individual .aspx page located directly under the site folder. Once the page is opened properly, try to open the desired actual '.aspx' or the '.master' file.