Steps to reproduce:

1. Create a HTTP agent item.
2. Input data on mandatory files
3. Input certificate file name on "SSL certificate file".
4. Input key file name on "SSL key file".
5. 
6. Add item.
7. Test Item.
8. 
9. Execute Now

Result:
Expected:
Same result obtained on item test.

Certificate and key files do match:

This bug appeared after upgrade from version 6.4.14 to 7.0.0