使用 HttpWebRequest 获取多个 SQL 报告 - 401 Unauthorized

Question

我正在尝试调用多个 SQL Reporting Services 报告，取回 .pdf，然后将它们附加在一起。我在附加 .pdf 文件时没有问题，但在第二份报告中出现错误。下面是一些示例代码：

    Dim httpReq As System.Net.HttpWebRequest = DirectCast(System.Net.WebRequest.Create(strLink), System.Net.HttpWebRequest)
    Dim creds As New System.Net.NetworkCredential
    creds.Domain = "MyDomain"
    creds.UserName = "UserName"
    creds.Password = "Password"

    httpReq.Credentials = creds

    Dim httpResp As System.Net.HttpWebResponse = DirectCast(httpReq.GetResponse(), System.Net.HttpWebResponse)
    httpResp.Close()
    httpReq = Nothing
    httpResp = Nothing

    Dim SecondHttpReq As System.Net.HttpWebRequest = DirectCast(System.Net.WebRequest.Create(strSecondLink), System.Net.HttpWebRequest)
    SecondHttpReq.Credentials = creds

    Dim SecondHttpResp As System.Net.HttpWebResponse = DirectCast(SecondHttpReq.GetResponse(), System.Net.HttpWebResponse)

当我尝试创建第二个 HttpResponse 时，我收到 401 Unauthorized 错误。当我检查 SecondHttpReq 对象出错时，我发现 Credentials 属性已被设置回 Nothing。我试过使用 CookieContainer 无济于事。我真的不想写一个父/子报告来把这些放在一起，所以我想听听其他选择。提前致谢。

Answer 1

已修复。有人在未通知任何人的情况下更改了我们报表服务器的权限。