Our application is attempting to write a file to a UNC folder using an ASP.NET web service running under .NET 4.5, IIS 7.5, and Windows Server 2008 R2. Howeve
I have faced same issue, I resolved by creating one domain account for each environemt (QA, STAGE, PRODUCTION). In Application pool identity I have set custom account and I used domain user for respective account. Now It gives me the ability to write and read the files from UNC Path.