Microsoft itself uses Certificate Trust List files to auto-update the Root Trust List on Windows. This "feature" of SCHANNEL.DLL, the library supporting the Microsoft implementation of TLS, allows Microsoft operating system to successfully trust TLS interfaces publishing incomplete chains, as long as that chain was successfully negotiated with a different interface before. The client then uses the Signer attribute of the final intermediate certificate to determine if a root certificate exists in the explicit trust store.Īs an aside, Windows platforms save the intermediate certificates received during TLS negotiation in the Intermediate Certificate Authorities store. Gmail SSL/TLS interfaces should send to the connecting client a certificate chain during the Server Hello response that contains all of the intermediate certificates to connect the leaf certificate to the root for that chain. Took me about 30 seconds each to download and install these certificates, so should take less than 10 minutes all up.įirst, only the root certificates should need to be installed into the Trusted Root Certification Authorities certificate store on the Window host running hMailServer.
In the Windows Certificate installer select that all certificates get installed for 'local machine' as opposed to 'current user', but other wise defaults are fine. To install the certificates manually, download the PEM certs, and then double click on them and let the windows certificate installer handle the installation.Ĭurrently there are 15 PEM certs that need to ALL be installed - but this number may change. Google have created their own (self signed) CAs, and I can't see that Microsoft has installed them automatically yet, but that may happen in a future windows update. The correct fix (much more secure) is to leave hmailserver to 'verify remote server SSL/TLS certificates' and to install all of the root CA and Subordinate CA certificates individually that are detailed on this page This stops ALL certificate verification and could open your server up for a man-in-the-middle attack. The easy fix (unsecure) is to deselect the checkbox 'Verify remote server SSL/TLS certificates' check box in SSL/TLS in the hMailserver Admin GUI. Session Id: 151, Remote IP: 209.85.147.109, Error code: 336134278, Message: certificate verify failed" when using the and on ports 465 and 587.This is additionally the case for External Account Downloads to We ran into an issue yesterday of getting "TCPConnection - TLS/SSL handshake failed.
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