User1535942433 posted
Hi id3ma,
Accroding to your description,as far as I think,there are two ways:
1.set default page in iis:
Administrative Tools-> IIS Manager -> You Server Name -> Your site name -> Under HTTP features -> Default document -> Add MyDefaultPage.aspx -->Enable


2.write follow in web.config:
<defaultDocument>
<files>
<clear />
<add value="Logon/LogonScreen.aspx" />
</files>
</defaultDocument>
More details,you could refer to below article:
https://forums.asp.net/t/1882785.aspx?IIS+not+dispalaying+default+page
Best regards,
Yijing Sun