Issue Trusted location in Sharepoint 2013

Three  Solution to fix the Excel Client Issue:

1.       At the Document Library set the "Opening Documents in the Browser" setting to "Open in client application". Go to Library settings

Click on Advance setting

Then select the “Open in the client Application” and OK.

2.        

• Central Administration --> Manage service applications.
• Click on Excel services Application.
• Then click on Trusted file locations
• You can see that http:// is already there, (you may want to add https:// if the URL is secured) 
• Also Check the Children Trusted box.

     3. At the site collection level activate the "Open Documents in Client Applications by default Feature"