Bypass invalid SSL certificate errors when calling web services in Net

Question

We are setting up a new SharePoint for which we don t have a valid SSL certificate yet  I would like to call the Lists web service on it to retrieve some meta data about the setup  However  when I try to do this  I get the exception      The underlying connection was closed  Could not establish trust relationship for the SSL TLS secure channel    The nested exception contains the error message      The remote certificate is invalid according to the validation procedure    This is correct since we are using a temporary certificate   My question is  how can I tell the  Net web service client  SoapHttpClientProtocol  to ignore these errors

User · Answer

ServicePointManager ServerCertificateValidationCallback                 mender  certificate  chain  sslPolicyErrors    gt  true    will bypass invaild ssl   Write it to your web service constructor

User · Answer

To further expand on Simon Johnsons post - Ideally you want a solution that will simulate the conditions you will see in production and modifying your code won t do that and could be dangerous if you forget to take the code out before you deploy it   You will need a self-signed certificate of some sort  If you re using IIS Express you will have one of these already  you ll just have to find it  Open Firefox or whatever browser you like and go to your dev website  You should be able to view the certificate information from the URL bar and depending on your browser you should be able to export the certificate to a file   Next  open MMC exe  and add the Certificate snap-in  Import your certificate file into the Trusted Root Certificate Authorities store and that s all you should need  It s important to make sure it goes into that store and not some other store like  Personal   If you re unfamiliar with MMC or certificates  there are numerous websites with information how to do this   Now  your computer as a whole will implicitly trust any certificates that it has generated itself and you won t need to add code to handle this specially  When you move to production it will continue to work provided you have a proper valid certificate installed there  Don t do this on a production server - that would be bad and it won t work for any other clients other than those on the server itself

User · Answer

The approach I used when faced with this problem was to add the signer of the temporary certificate to the trusted authorities list on the computer in question   I normally do testing with certificates created with CACERT  and adding them to my trusted authorities list worked swimmingly   Doing it this way means you don t have to add any custom code to your application and it properly simulates what will happen when your application is deployed  As such  I think this is a superior solution to turning off the check programmatically

User · Answer

For newbies  you can extend your partial service class in a separate cs file and add the code the code provided by  imanabidi  to get it integrated

User · Answer

Alternatively you can register a call back delegate which ignores the certification error       ServicePointManager ServerCertificateValidationCallback   MyCertHandler       static bool MyCertHandler object sender  X509Certificate certificate  X509Chain chain  SslPolicyErrors error       Ignore errors return true

User · Answer

I was having same error using DownloadString  and was able to make it works as below with suggestions on this page  System Net WebClient client   new System Net WebClient                ServicePointManager ServerCertificateValidationCallback   delegate   return true     string sHttpResonse   client DownloadString sUrl

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Alternatively you can register a call back delegate which ignores the certification error       ServicePointManager ServerCertificateValidationCallback   MyCertHandler       static bool MyCertHandler object sender  X509Certificate certificate  X509Chain chain  SslPolicyErrors error       Ignore errors return true

User · Answer

I solved it this way   Call the following just before calling your ssl webservice that cause that error   using System Net  using System Net Security  using System Security Cryptography X509Certificates        lt summary gt      solution for exception     System Net WebException       The underlying connection was closed  Could not establish trust relationship for the SSL TLS secure channel  --- gt  System Security Authentication AuthenticationException  The remote certificate is invalid according to the validation procedure       lt  summary gt  public static void BypassCertificateError         ServicePointManager ServerCertificateValidationCallback             delegate              Object sender1              X509Certificate certificate              X509Chain chain              SslPolicyErrors sslPolicyErrors                        return true

User · Answer

Like Jason S s answer   ServicePointManager ServerCertificateValidationCallback   delegate   return true       I put this in my Main and look to my app config and test if  ConfigurationManager AppSettings  IgnoreSSLCertificates       True   before calling that line of code

[.net] Bypass invalid SSL certificate errors when calling web services in .Net

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