When trying to log on to the Web API interface an error is displayed:
“No Connection possible to the API on the following URL http://localhost/SpiderAPI”
![peter_link_0-1671092558264.png peter_link_0-1671092558264.png](https://community.flexera.com/t5/image/serverpage/image-id/10955i5DB444084363B411/image-size/medium?v=v2&px=400)
The solution is to edit the rootURL config file. To do so open IIS.
IIS contains two sites for API access: SpiderAPI and SpiderAPIExplorer
Right-click SpiderAPI in IIS and click on Explore, this opens the path
C:\Program Files\Spider\CoreServer_00\WebAPI
Then click on the folder named _Settings
![peter_link_1-1671092558273.png peter_link_1-1671092558273.png](https://community.flexera.com/t5/image/serverpage/image-id/10953iAA91DCD082E45171/image-size/medium?v=v2&px=400)
and open the rootURL.config file
![peter_link_2-1671092558302.png peter_link_2-1671092558302.png](https://community.flexera.com/t5/image/serverpage/image-id/10954i374C64FF6A75B06E/image-size/medium?v=v2&px=400)
On some occasions this entry has been incorrect, make sure the rootURL.config file contains the line http://localhost/spiderapi (name of API instance may be different depending on Spider configuration)
To access the Spider API create a user with the role CoreReader
![peter_link_3-1671092558317.png peter_link_3-1671092558317.png](https://community.flexera.com/t5/image/serverpage/image-id/10956i2A9AC0AE4903D65D/image-size/medium?v=v2&px=400)
Now access SpiderAPI with this URL: http://localhost/SpiderAPIExplorer and enter logon credentials
![peter_link_4-1671092558337.png peter_link_4-1671092558337.png](https://community.flexera.com/t5/image/serverpage/image-id/10958iE8405959F404816F/image-size/medium?v=v2&px=400)
To verify that the Spider API functions the URL http://localhost/SpiderAPI/version should return information as shown below
![peter_link_5-1671092558345.png peter_link_5-1671092558345.png](https://community.flexera.com/t5/image/serverpage/image-id/10957iBB0248296BBBC17C/image-size/medium?v=v2&px=400)