One of the certificates of the chain is invalid.It can be used for a usage it was not allowed to.it can be tampered (the signature is invalid).It can have a weak signature (it uses an unsecured algorithm for the signature).It can be revoked (check the Certificate Revocation List (CRL) ).Here're some of the reasons a certificate is invalid: To do it right you need to know the reasons why a certificate can be invalid and handle only the case you are interested in. In this case, you need to implement your certificate validation.NET allows you to override the default certificate validation, but many people use it to disable the validation… This is very bad as it reduces the security of your application. NET will throw an exception when a certificate cannot be validated: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. However, there are some cases where you cannot add the certificate to the store and benefit from the automatic validation. Thus, all applications can validate the root certificate using the certificate store. Other mechanisms could be used on other operating systems. On Windows, you can add the root certificate to the Certificate Store using a GPO so it's very easy. While this is very convenient for a company as they can generate certificates on demand, it means that every software that makes a call to a https internal service must be aware of the internal root certificate. Many companies run their certificate authority (CA).
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