I have OS Windows Server 2008 Standard SP2 with IIS 7.0 on which portal application is setup which has a Url Rewrite rules, as per the Web Pen Test report we have to disable weak ciphers and protocols so we disabled SSL3.0 and TLS1.0 and installed the support patch and enabled registry for TLS 1.1 and TLS 1.2. But immediately after this steps I am getting error "502 - Web server received an invalid response while acting as a gateway or proxy server." while communicating with rest service.
We also did registry settings as per the post https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in and Enable the SchUseStrongCrypto property in the Windows registry to use as the default protocols: TLS 1.1 and TLS 1.2 for below registry keys,
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NetFramework\v4.0.30319
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NetFramework\v4.0.30319
But still I am getting same error. What else I am missing or is Windows Server 2008 standard SP2 and IIS 7.0 do not completely support TLS1.1 and TLS1.2. I feel this is something related to ARR and WinHttp but I am not getting any thing from web, any help on this is really an appreciable.
Thanks,
Prohharish