I'm trying to enable TLS 1.2 for outgoing connections from a classic ASP site running on IIS. I have tried adding the registry settings outlined in the questions below but this hasn't helped.

Check if Windows Server 2008R2 can use TLS 1.2 How do I disable TLS 1.0 without breaking my IIS/ASP.NET websites?

The app pool for this site has Enable 32-bit applications set to True. I noticed that if I create a new site and set Enable 32-bit applications to False then outbound traffic from the test site uses TLS 1.2.


Windows Server 2008 requires an update to enable support for TLS 1.1/1/2:


RDS support for TLS 1.1/1.2 Windows 2008 R1 SP2

  • Just to clarify, setting the app pool to Enable 32-bit Applications = False allows outbound TLS 1.2 connections. My specific issue seems to be concerned with when 32-bit applications are enabled. – Ged Sep 11 '18 at 6:56

I ended up using MITMProxy to bump up the traffic from TLS 1.0 to TLS 1.2.

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