Azure App Service - connection attempt failed

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lnl@energidanmark.dk
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Denmark

Azure App Service - connection attempt failed

The Solution in short:

App Service running .NET App
Always on is set to On.

The App are Downloading file and fileinfo from Ftp server using WinSCP in the C# code.

From Log file:
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
It seems to fail at the code part:
var sessionOptions = new SessionOptions()
                {
                    Protocol = Protocol.Ftp,
                    HostName = _hostName,
                    UserName = _userName,
                    Password = _password,
                    TimeoutInMilliseconds = 60000,                    
                };
_session = new Session();
_session.DisableVersionCheck = true;
_session.DebugLogLevel = 0;
_session.ExecutablePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "winscp.exe");
_session.Open(sessionOptions)
The error only occurs when vi run the App on Azure, I cannot recreate the error in Debug on my local machine. If I debug the App local, it seems to get the production App on Azure to start running.

I do not know if I have to change the WinSCP settings in the code, or I should change the settings in Azure App Service.

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martin
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Re: Azure App Service - connection attempt failed

If the code works in other environments, I'm quite sure that no change in the code will help to make it working on Azure. This looks like a firewall issue.

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