Error message "Microsoft Office Excel cannot access the file" when you try to access Excel files remotely from SharePoint Document Library on SBS 2008

Applies to: Windows Small Business Server 2008 PremiumWindows Small Business Server 2008 Standard


When you try to access excel files remotely from Sharepoint Document Library you get message
Microsoft Office Excel cannot access the file ‘https: //'. There are several possible reasons:
‘The file name or path does not exist.
‘The file is being used by another program.
The workbook you are trying to save has the same name as a currently open workbook.

When you try to access Excel files from SharePoint Document Library Internally (http://companyweb) everything works

If you change Alternate Access mapping from to and remove the SSL Binding from the SharePoint website everything works


One of the reasons could be Incorrect Certificate in IIS


Import the correct Certificate and Install it in IIS

You can follow below mentioned blogs for your reference
Introducing the “Add a Trusted Certificate Wizard” in SBS 2008
How to Manually Install Certificates in SBS 2008