Azure - Website - WebJob - Active FTP Download - azure

Question

I am working with Windows Azure Websites and Web Jobs.
I have a console application that I use to download an FTP file nightly. They recently switch from passive to active FTP. I do not have any control over this.
The code attached was working for passive and works for active on my computer. However, it does not work when I add it to a webjob on Azure.
In this code I am able to get the content length, so I am logging in correctly and I have the correct URL.
Dim request As FtpWebRequest = DirectCast(FtpWebRequest.Create(strTempFTPUrl), FtpWebRequest)
request.Method = WebRequestMethods.Ftp.GetFileSize
Dim nc As New NetworkCredential(FTPUserName, FTPPassword)
request.Credentials = nc
request.UseBinary = True
request.UsePassive = False
request.KeepAlive = True
request.Proxy = Nothing
' Get the result (size)
Dim resp As FtpWebResponse = DirectCast(request.GetResponse(), FtpWebResponse)
Dim contLen As Int64 = resp.ContentLength
' and now download the file
request = DirectCast(FtpWebRequest.Create(strTempFTPUrl), FtpWebRequest)
request.Method = WebRequestMethods.Ftp.DownloadFile
request.Credentials = nc
request.UseBinary = True
request.UsePassive = False
request.KeepAlive = True
request.Proxy = Nothing
resp = DirectCast(request.GetResponse(), FtpWebResponse)
The error that I receive is this:
The underlying connection was closed: An unexpected error occurred on a receive. This happens on the second "resp = DirectCast(request.GetResponse(), FtpWebResponse)"
Does anyone have any suggestions on what I can do?
Edit: This is not a VM so as far as I know I do not have control over the firewall. This is a standard website.
Thank you very much!

Answer 1

I was with this same problem, I was able to solve by increasing the connection limit per point. By default it comes set to 2 I increased to 10
req.ServicePoint.ConnectionLimit = 10;
If you have timeout problem, also change the properties timeout and readwritetimeout.
Below is the link for a case similar to ours.
How can I programmatically remove the 2 connection limit in WebClient