using share point designer 2013 i can not open master page and edit master page all the settings for share point designer allowed for web application level.
SharePoint Farm has 2 WFE Servers Web Application created on Port 81 Web Application URL: First WFE Server name & Port: http://spTestWfe1:81 Port 81 is allowed from my PCto WFE
when i try to edit master pages or page layouts below is the message from SPD
could not find a webserver at '' on port 81. please check to make sure that the web server name is valid and your proxy settings are set correctly sharepoint designer