I have a simple class in an ASP.NET webservice. It runs fine on my local system and even on the development environment I've set up, but Anytime I try to send a file on the production server I get the following error:
Exception Error: The underlying provider failed on Open.
Here is the code that is being called:
public class FTPHelper
{
public static string SendFile(string ftpuri, string username, string password, string ftppath, string filename, byte[] datatosend)
{
if (ftppath.Substring(ftppath.Length - 1) != "/")
{
ftppath += "/";
}
FtpWebRequest ftp = (FtpWebRequest) FtpWebRequest.Create( ftpuri + ftppath + filename);
ftp.Method = WebRequestMethods.Ftp.UploadFile;
ftp.Credentials = new NetworkCredential(username, password);
ftp.UsePassive = true;
ftp.ContentLength = datatosend.Length;
Stream requestStream = ftp.GetRequestStream();
requestStream.Write(datatosend, 0, datatosend.Length);
requestStream.Close();
FtpWebResponse ftpresponse = (FtpWebResponse)ftp.GetResponse();
return ftpresponse.StatusDescription;
}
}
How can I troubleshoot this issue. The Server is IIS 7.5 running on Windows 2008 Server. I'm using .NET 4.0. Is there a simple reason why the FtpWebResponse would not be working?
If it's a security issue, then is there any way around it? I need to get this working immediately.
It was a security issue, the user that the website was running as did not have permission to establish the FTP connection. I am a programmer and not a web site administrator, so I did not have a clue how to accomplish this. After searching through Microsoft's IIS help on IIS, finally worked my way through it. The solution to change the user is on SuperUser:
https://superuser.com/q/307168/68967
If anyone has any better solutions, please respond. If anyone feels this would open up security issues, also, please post more information.
Related
I need access to files that are in a files server in my LAN from my Angular app.
I assume that I need to publish my Angular app in the same network, that is, in my IIS Server inside the same LAN
Now on my local machine, I try to access my shared folder \192.168.100.7\OfertasHistoric" but I don´t know how to do it.
When I try this
[HttpGet("directorio")]
public async Task<ActionResult<string[]>> GetDirectoryContents()
{
string[] files = Directory.GetFiles(#"\\192.168.100.7\ofertashistorico");
return files;
}
I get this error
System.IO.DirectoryNotFoundException: Could not find a part of the path '/Users/kintela/Repos/Intranet-WebAPI/Intranet.API/\192.168.100.7\ofertashistorico'
It seems that the path that you give to the GetFiles method only searches from the current directory where the project is located downwards and I don't know how to indicate a different one.
I also do not know how to manage the issue of the credentials necessary to access said resource
Any idea, please?
Thanks
I am using below code and it works for me. Please check it.
Steps:
Navigate to the path like : \\192.168.2.50\ftp
Delete \ftp, the address in folder explorer should be \\192.168.2.50, find the folder you want, right click and map network drive.
You can try it with this address ftp:\\192.168.2.50, it will pop up a window. Input you usename and password, then you can check the files.
Test Result
Sample code
[HttpGet("directorio")]
public IActionResult GetDirectoryContents()
{
string networkPath = #"ftp:\\192.168.2.50";
string userName = #"Administrator";
string password = "Yy16";
#region FtpWebRequest
var networkCredential = new NetworkCredential(userName, password);
var uri = new Uri(networkPath);
var request = (FtpWebRequest)WebRequest.Create(uri);
request.Credentials = networkCredential;
request.Method = WebRequestMethods.Ftp.ListDirectory;
try
{
using (var response = (FtpWebResponse)request.GetResponse())
{
using (var stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
Console.WriteLine(reader.ReadToEnd());
}
}
}
}
catch (WebException ex)
{
Console.WriteLine("Access to the path '" + networkPath + "' is denied. Error message: " + ex.Message);
}
#endregion
return Ok();
}
How to download a image from a protected below link http://epaper.manoramaonline.com/MMDaily/Malappuram/2014/05/30/F/MMDaily_Malappuram_2014_05_30_F_FP_001/1228_274_1940_1862.jpg
while I downloading this jpeg file the following error was display " the remote server returned an error (403) forbidden". Please help me to find a solution.
The following code was used..
My.Computer.Network.DownloadFile("http://epaper.manoramaonline.com/MMDaily/Malappuram/2014/05/30/F/MMDaily_Malappuram_2014_05_30_F_FP_001/1228_274_1940_1862.jpg", "D:/ynews.jpg")
You might need to specify the network credential to bypass the authorization and authentication. I can give you an example of C# Code of the same. You check the same with VB.Net and try to resolve.
WebClient webClient = new WebClient();
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(webClient_DownloadFileCompleted);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
webClient.Credentials = new NetworkCredential("user", "pass");
webClient.DownloadFileAsync(new Uri("http://example.com/example.jpg"), #"c:\myfile.txt");
I am trying to programmatically render a PDF using Azure Reporting Services. I suspect that the actual PDF retrieval is fine, but I cannot find a way to authenticate the connection before requesting the report (via URL). I am working in the services layer of my web application and I cannot use a web reference (might not work with Azure) and it doesn't make sense to use a ReportViewer control (since it's a service layer method).
I have all the details to connect, but I suspect that I require a cookie to authenticate and I'm not sure how to manually create this. Any suggestions/solutions?
Here's my code so far:
string userName = BJConfigurationManager.GetSetting("ReportingServiceUsername");
string password = BJConfigurationManager.GetSetting("ReportingServicePassword");
NetworkCredential networkCredential = new NetworkCredential(userName, password);
Domain.Report report = GetReportById(id);
int timeout = 30; //seconds
string url = "https://bleh.ctp.reporting.database.windows.net/ReportServer/Pages/ReportViewer.aspx?...";
string destinationFileName = "#C:\\Temp.pdf";
// Create a web request to the URL
HttpWebRequest MyRequest = (HttpWebRequest)WebRequest.Create(url);
MyRequest.PreAuthenticate = true;
MyRequest.Credentials = networkCredential;
MyRequest.Timeout = timeout * 1000;
try
{
// Get the web response -- THE RESPONSE COMES BACK AS UNAUTHENTICATED...
HttpWebResponse MyResponse = (HttpWebResponse)MyRequest.GetResponse();
Check out the section titled "SOAP Management Endpoint Programmatic Access":
http://msdn.microsoft.com/en-us/library/windowsazure/771e88b6-ab0f-4910-a5fa-5facd8d56767#SOAPManagement.
It explains how to authenticate using a cookie container without a ReportViewer control.
I don't think that is going to work. Azure Reporting uses Forms Authentication and as I understand it, you aren't going to be able to match the Forms Auth cookie along with the MachineKey for encryption.
I was trying to accomplish the same task..but using a WebRequest was impossible.
I changed the approach using a ServerReport class like this:
ServerReport report;
report = new ServerReport();
report.ReportServerUrl = new Uri(reportServerName + "/ReportServer");
report.ReportPath = "/ReportPath";
report.ReportServerCredentials = new ReportServerCredentials();
report.SetParameters(new Microsoft.Reporting.WebForms.ReportParameter("param1", param1));
report.SetParameters(new Microsoft.Reporting.WebForms.ReportParameter("param2", param1));
return report.Render(reportParams.OutputFormat);
The ReportServerCredentials class must implement the IReportServerCredentials interface like this.
More info about the IReportServerCredentials interface and implementation here.
I'm trying to call the AddAttachment of the Lists.asmx SharePoint web service the below code works fine if I'm calling the web service over HTTP.
Dim img(MyFile.PostedFile.ContentLength - 1) As Byte
MyFile.PostedFile.InputStream.Read(img, 0, img.Length)
'Dim fStream As FileStream = File.OpenRead(FullFileName)
Dim fileName As String = MyFile.PostedFile.FileName.Substring(3)
Dim listService As New wsList.Lists()
Dim credentials As New System.Net.NetworkCredential(UserName, Password, Domain)
If Not SiteUrl.EndsWith("/") Then
SiteUrl += "/"
End If
SiteUrl += "_vti_bin/Lists.asmx"
'SiteUrl = SiteUrl.ToLower.Replace("http:", "https:")
listService.Url = SiteUrl
listService.Credentials = credentials
Dim addAttach As String = listService.AddAttachment(ListName, ItemId, fileName, img)
ReturnValue = True
However if I uncomment out this line
'SiteUrl = SiteUrl.ToLower.Replace("http:", "https:")
I will get the following error: The request failed with HTTP status 401: Unauthorized
Now if I leave the above line commented out AND then also comment out this line
listService.Credentials = credentials
I will get the same 401 error (expected) so it appears the credentials are being accepted correctly over HTTP but not HTTPS. Can one help explain this to me and have any thoughts on how to fix the issue?
Thanks in advance!
This morning I was working with one of our system guys. He checked some IIS logs and could see errors trying to access the web service over HTTPS. He went into Central Admin and added some Alternate Access Mappings to include the HTTPS urls. Then everything worked!
I need to make my CF app self-updating through the web service.
I found one article on MSDN from 2003 that explains it quite well. However, I would like to talk practice here. Anyone really done it before or does everyone rely on third party solutions?
I have been specifically asked to do it this way, so if you know of any tips/caveats, any info is appreciated.
Thanks!
This is relatively easy to do. Basically, your application calls a web service to compare its version with the version available on the server. If the server version is newer, your application downloads the new EXE as a byte[] array.
Next, because you can't delete or overwrite a running EXE file, your application renames its original EXE file to something like "MyApplication.old" (the OS allows this, fortunately). Your app then saves the downloaded byte[] array in the same folder as the original EXE file, and with the same original name (e.g. "MyApplication.exe"). You then display a message to the user (e.g. "new version detected, please restart") and close.
When the user restarts the app, it will be the new version they're starting. The new version deletes the old file ("MyApplication.old") and the update is complete.
Having an application update itself without requiring the user to restart is a huge pain in the butt (you have to kick off a separate process to do the updating, which means a separate updater application that cannot itself be auto-updated) and I've never been able to make it work 100% reliably. I've never had a customer complain about the required restart.
I asked this same question a while back:
How to Auto-Update Windows Mobile application
Basically you need two applications.
App1: Launches the actual application, but also checks for a CAB file (installer). If the cab file is there, it executes the CAB file.
App2: Actual application. It will call a web service, passing a version number to the service and retrieve a URL back if a new version exists (). Once downloaded, you can optionally install the cab file and shut down.
One potiencial issue: if you have files that one install puts on the file system, but can't overwrite (database file, log, etc), you will need two separate installs.
To install a cab: look up wceload.exe http://msdn.microsoft.com/en-us/library/bb158700.aspx
private static bool LaunchInstaller(string cabFile)
{
// Info on WceLoad.exe
//http://msdn.microsoft.com/en-us/library/bb158700.aspx
const string installerExe = "\\windows\\wceload.exe";
const string processOptions = "";
try
{
ProcessStartInfo processInfo = new ProcessStartInfo();
processInfo.FileName = installerExe;
processInfo.Arguments = processOptions + " \"" + cabFile + "\"";
var process = Process.Start(processInfo);
if (process != null)
{
process.WaitForExit();
}
return InstallationSuccessCheck(cabFile);
}
catch (Exception e)
{
MessageBox.Show("Sorry, for some reason this installation failed.\n" + e.Message);
Console.WriteLine(e);
throw;
}
}
private static bool InstallationSuccessCheck(string cabFile)
{
if (File.Exists(cabFile))
{
MessageBox.Show("Something in the install went wrong. Please contact support.");
return false;
}
return true;
}
To get the version number: Assembly.GetExecutingAssembly().GetName().Version.ToString()
To download a cab:
public void DownloadUpdatedVersion(string updateUrl)
{
var request = WebRequest.Create(updateUrl);
request.Credentials = CredentialCache.DefaultCredentials;
var response = request.GetResponse();
try
{
var dataStream = response.GetResponseStream();
string fileName = GetFileName();
var fileStream = new FileStream(fileName, FileMode.CreateNew);
ReadWriteStream(dataStream, fileStream);
}
finally
{
response.Close();
}
}
What exactly do you mean by "self-updating"? If you're referring to configuration or data, then webservices should work great. If you're talking about automatically downloading and installing a new version of itself, that's a different story.
Found this downloadable sample from Microsoft- looks like it should help.
If you want to use a third-party component, have a look at AppToDate developed by the guys at MoDaCo.