Error “431 Failed to setup secure session” when connecting to a FTP Server with multiple FTP sites

Summary for lazy readers Let’s consider this scenario: We are using FTPs (FTP over SSL) to connect to a FTP site hosted on a Windows Server 2008 or later We have multiple FTP sites using SSL and we are using the virtual hostname feature FTP clients suddenly report connection error: “431 Failed to setup secure…


Troubleshooting TLS / SSL communication problems for ASP.NET applications making HTTP Web Request or WCF queries to SSL endpoints – Scenario 3

In our first and second posts about troubleshooting the TLS / SSL problems, we worked to fix a “The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel” error message. We made some basic tests, such as a “browser test” and found that the certificate used was not valid and then…

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Troubleshooting TLS / SSL communication problems for ASP.NET applications making HTTP Web Request or WCF queries to SSL endpoints – Scenario 2

This is the second part of our series of articles about troubleshooting TLS / SSL communications problems when you make Http Web Request or WCF queries from your ASP.NET applications to SSL endpoints. In our first scenario, we troubleshooted a “The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel” error message. We…

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Troubleshooting TLS / SSL communication problems for ASP.NET applications making HTTP Web Request or WCF queries to SSL endpoints – Scenario 1

This is the first part of a series of articles about troubleshooting TLS / SSL communications problem when you make Http Web Request or WCF queries from your ASP.NET applications to SSL endpoints. As explained in the introduction article, we will cover some of the problems for our simple ASP.NET 4.6 application which makes an…

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Troubleshooting TLS / SSL communication problems for ASP.NET applications making HTTP Web Request or WCF queries to SSL endpoints – Introduction

This is the introduction post of a series of articles about troubleshooting TLS / SSL communications problem when you make Http Web Request or WCF queries from your ASP.NET applications to SSL endpoints. Consider the following set up: You are running an ASP.NET application which makes an HTTPS request to an endpoint and the response…

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