we have using Office 2013 custom add-in developed in c#. we are uploading the excel files using our add-in. we have multiple Linked excel files. after uploading file to the webserver we are updating the External Reference Links using "WorkBook.ChangeLink" methode.
example: Workbook.ChangeLink("c:/12345.xlsx","httpurl/12345.xlsx","Excel.XlLinkType.xlLinkTypeExcelLinks")
cell value is showing as "#REF!"
when we click on "updateValues" in edit links it is asking for webserver login credentials. it is working fine other office versions.