Are you using impersonate?
If so, please follow the steps below:
1. please check your web.config file and make sure you use
impersonation in your web config.
Step 1: Create a domain account which has the write permission to your UNC share
Username: yourdomain/admin
password="admin”
To access resources on a UNC, your application must run under a domain enabled primary secuirty token, the easiest way to do this is to use impersonation in your web config:
<identity
impersonate="true"
userName="yourdomain/admin"
password="admin”
/>
2. Have anonymous disabled in IIS and have Windows set for authentication mode in ASP.NET.
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