How to solve Could not establish trust relationship for the SSL TLS secure channel with authority

Question

Really thought I had this issue fixed  but it was only disguised before    I have a WCF service hosted in IIS 7 using HTTPS  When I browse to this site in Internet Explorer  it works like a charm  this is because I have added the certificate to the local root certificate authority store    I m developing on 1 machine  so client and server are same machine  The certificate is self-signed directly from IIS 7 management snap in   I continually get this error now        Could not establish trust relationship for the SSL TLS secure channel with authority        when called from client console   I manually gave myself permissions and network service to the certificate  using findprivatekey and using cacls exe   I tried to connect to the service using SOAPUI  and that works  so it must be an issue in my client application  which is code based on what used to work with http   Where else can I look I seem to have exhausted all possibilities as to why I can t connect

User · Answer

Add this to your client code    ServicePointManager ServerCertificateValidationCallback   new RemoteCertificateValidationCallback      delegate               return true

User · Answer

If you use  net core try this   client ClientCredentials ServiceCertificate SslCertificateAuthentication           new X509ServiceCertificateAuthentication                         CertificateValidationMode   X509CertificateValidationMode None              RevocationMode   System Security Cryptography X509Certificates X509RevocationMode NoCheck

User · Answer

the first two use lambda  the third uses regular code    hope you find it helpful                Trust all certificates             System Net ServicePointManager ServerCertificateValidationCallback                     sender  certificate  chain  sslPolicyErrors    gt  true                   trust sender             System Net ServicePointManager ServerCertificateValidationCallback                     sender  cert  chain  errors    gt  cert Subject Contains  YourServerName                     validate cert by calling a function             ServicePointManager ServerCertificateValidationCallback    new RemoteCertificateValidationCallback ValidateRemoteCertificate           callback used to validate the certificate in an SSL conversation     private static bool ValidateRemoteCertificate object sender  X509Certificate cert  X509Chain chain  SslPolicyErrors policyErrors                bool result   false          if  cert Subject ToUpper   Contains  YourServerName                          result   true                     return result

User · Answer

I had the same problem  I also had added CA certificates in the local store  but I did in the WRONG way   Using mmc Console  Start -  Run -  mmc   you should add Certificates snap-in as Service account  choosing the service account of IIS  or Computer account  it adds for every account on the machine    Here an image of what I m talking about    From here now  you can add certificates of CAs  Trusted Root CAs and Intermediate CAs   and everything will work fine

User · Answer

I had similar issue with self-signed certificate  I could resolve it by using the certificate name same as FQDN of the server   Ideally  SSL part should be managed at the server side  Client is not required to install any certificate for SSL  Also  some of the posts mentioned about bypassing the SSL from client code  But I totally disagree with that

User · Answer

Your problem arises because you re using a self signed key  The client does not trust this key  nor does the key itself provide a chain to validate or a certificate revocation list   You have a few options - you can    turn off certificate validation on the client  bad move  man in the middle attacks abound  use makecert to create a root CA and create certificates from that  ok move  but there is still no CRL  create an internal root CA using Windows Certificate Server or other PKI solution then trust that root cert  a bit of a pain to manage   purchase an SSL certificate from one of the trusted CAs  expensive

User · Answer

When I have this problem it is because the client config had its endpoints like    https   myserver myservice svc    but the certificate was expecting    https   myserver mydomain com myservice svc   Changing the endpoints to match the FQDN of the server resolves my problem  I know this is not the only cause of this problem

User · Answer

I just wanted to add something to the answer of  NMrt who already pointed out   you could encounter this error if your client is running the wrong TLS version  for example if the server is only running TLS 1 2   With Framework 4 7 2  if you do not explicitly configure the target framework in your web config like this  lt system web gt     lt compilation targetFramework  quot 4 7 quot    gt     lt httpRuntime targetFramework  quot 4 7 quot    gt   lt  system web gt   your system default security protocols will be ignored and something  quot lower quot  might be used instead  In my case Ssl3 Tls instead of Tls13   You can fix this also in code by setting the SecurityProtocol  keeps other protocols working   System Net ServicePointManager SecurityProtocol    System Net SecurityProtocolType Tls12   System Net SecurityProtocolType Tls11  System Net ServicePointManager SecurityProtocol  amp    System Net SecurityProtocolType Ssl3    or even by adding registry keys to enable or disable strong crypto  HKEY LOCAL MACHINE SOFTWARE Microsoft  NETFramework v4 0 30319   quot SchUseStrongCrypto quot  dword 00000001    This blog post pointed me to the right direction and explains the backgrounds better than I can  https   www ryadel com en asp-net-client-server-cannot-comunicate-because-they-possess-common-algorithm-how-to-fix-c-sharp

User · Answer

I encountered the same problem and I was able to resolve it with two solutions  First  I used the MMC snap-in  Certificates  for the  Computer account  and dragged the self-signed certificate into the  Trusted Root Certification Authorities  folder  This means the local computer  the one that generated the certificate  will now trust that certificate  Secondly I noticed that the certificate was generated for some internal computer name  but the web service was being accessed using another name  This caused a mismatch when validating the certificate  We generated the certificate for computer operations local  but accessed the web service using https   computer internaldomain companydomain com  When we switched the URL to the one used to generate the certificate we got no more errors   Maybe just switching URLs would have worked  but by making the certificate trusted you also avoid the red screen in Internet Explorer where it tells you it doesn t trust the certificate

User · Answer

As a workaround you could add a handler to the ServicePointManager s ServerCertificateValidationCallback on the client side   System Net ServicePointManager ServerCertificateValidationCallback         se  cert  chain  sslerror    gt                        return true               but be aware that this is not a good practice as it completely ignores the server certificate and tells the service point manager that whatever certificate is fine which can seriously compromise client security  You could refine this and do some custom checking  for certificate name  hash etc   at least you can circumvent problems during development when using test certificates

User · Answer

Please do following steps    Open service link in IE  Click on the certificate error mention in address bar and click on View certificates  Check issued to  name  Take the issued name and replace localhost mention in service and client endpoint base address name with A fully qualified domain name  FQDN     For Example  https   localhost 203 SampleService svc  To https   INL-126166- groupinfra com 203 SampleService svc

User · Answer

If you are using  net core  then during development you can bypass certificate validation by using compiler directives  This way will only validate certificate for release and not for debug   if  DEBUG          client ClientCredentials ServiceCertificate SslCertificateAuthentication                   new X509ServiceCertificateAuthentication                                         CertificateValidationMode   X509CertificateValidationMode None                      RevocationMode   System Security Cryptography X509Certificates X509RevocationMode NoCheck                       endif

User · Answer

This occurred when trying to connect to the WCF Service via  the IP e g  https   111 11 111 1 port MyService svc while using a certificate tied to a name e g  mysite com    Switching to the https   mysite com port MyService svc resolved it

User · Answer

A one line solution  Add this anywhere before calling the server on the client side   System Net ServicePointManager ServerCertificateValidationCallback    delegate   return true       This should only be used for testing purposes because the client will skip SSL TLS security checks

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I just dragged the certificate into the  Trusted Root Certification Authorities  folder and voila everything worked nicely   Oh  And I first added the following from a Administrator Command Prompt   netsh http add urlacl url https     8732 Servicename user NT-MYNDIGHET INTERAKTIV   I am not sure of the name you need for the user  mine is norwegian as you can see        user NT-AUTHORITY INTERACTIVE    You can see all existing urlacl s by issuing the command  netsh http show urlacl

User · Answer

In addition to the answers above  you could encounter this error if your client is running the wrong TLS version  for example if the server is only running TLS 1 2   You can fix it by using       tested in  NET 4 5  ServicePointManager SecurityProtocol   SecurityProtocolType Tls12

User · Answer

This occurred when trying to connect to the WCF Service using only host name e g  https   host MyService svc while using a certificate tied to a name e g  host mysite com   Switching to the https   host mysite com MyService svc and this resolved it

User · Answer

Just fixed a similar issue   I realized I had an application pool that was running under an account that only had reading permission over the certificate that it was used   The  NET application could correctly retrieve the certificate but that exception was thrown only when GetRequestStream   was called   Certificates permissions can be managed via MMC console

[wcf] How to solve "Could not establish trust relationship for the SSL/TLS secure channel with authority"

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