Error in accessing the image located in file manager in CPQ

Summary

Error in accessing the image located in file manager in CPQ

Content

dear all,

We are facing an issue with an image which was worked fine earlier now getting an issue.
saved the image in file manager and trying to access it in the XSL template.
where we are building the excel template using XSL.

File path: https://companyname.bigmachines.com/bmfsweb/CompanyName/image/Applications/header.png
Error on Excel file

"This linked image cannot be displayed. The file may have been removed, or deleted. Verify that the link points to the correct file and location". 

Able to access the google images links in an XSL file