title: Could not establish secure channel for SSL/TLS with authority when calling informatica server from .net WCF webservice on windows security update
body: <p>We have hosted a ASP.net application in the server.</p>
  
  <p>OS: Windows Server 2008 R2 Enterprise.
  .net FrameworK:MS .NET Framework 4.5.2 </p>
  
  <p>We do a informatica call from .net WCF Service.</p>
  
  <p>Server team applied the below patches in the server. After the new patches are installed, we are not able do the informatica call.</p>
  
  <p>Security patches applied:</p>
  
  <p>Kb2954853 <a href="http://support.microsoft.com/en-us/kb/2954853" rel="nofollow">http://support.microsoft.com/en-us/kb/2954853</a> 
  Kb2978128 <a href="http://support.microsoft.com/en-us/kb/2978128" rel="nofollow">http://support.microsoft.com/en-us/kb/2978128</a> </p>
  
  <p>Error:
  System.ServiceModel.Security.SecurityNegotiationException: Could not establish secure channel for SSL/TLS with authority 'ifccu1infsa1.ifc.org:8446'. </p>
  
  <p>Could you please help.</p>