Exception: The remote certificate is invalid according to the validation procedure

Problem reported by Steve_N - 9/1/2018 at 6:22 AM

Submitted

I upgraded from 16.3.6705 to 16.3.6816 and outbound connections to 188.125.73.28:465 fail with Exception: The remote certificate is invalid according to the validation procedure
[2018.09.01]    at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception)
[2018.09.01]    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
[2018.09.01]    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
[2018.09.01]    at RelayServer.Clients.SMTP.ClientConnectionSync.InitiateSsl(Boolean validateAllCerts)
[2018.09.01]    at RelayServer.Clients.SMTP.SmtpClientSession.Initialize(String #qCb, List`1 #RVi, String #64i)
I've verified the certificate and it's chain within the OS and there are no issues. The certificate has been in place for most of the year and I've not had a problem like this. I've reverted to 16.3.6705 and mail is being sent correctly again.

5 Replies

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Paul Blank Replied

9/1/2018 at 6:46 AM

Hope this is not an issue with V15 as well.

echoDreamz Replied

9/2/2018 at 11:11 AM

Have you tried using a valid hostname that matches the certificate to connect instead of the IP?

raneri andrea Replied

10/5/2018 at 6:07 AM

Hello Steve, is your problem with smartermail:

Exception: The remote certificate is invalid according to the validation procedure

resolved ?

I'have same problem from 05/09/18 after update, but I see this only now

Thanks

Andrea Raneri

Steve_N Replied

10/5/2018 at 7:09 AM

@echoDreamz - I'm already using a hostname that matches the certificate and that then resolves to 188.125.73.28.

@raneri andrea - It is with SmarterMail, I've not tried any versions since so I don't know if the problem has been resolved.

Steve_N Replied

11/10/2018 at 7:19 AM

I've upgraded to SmarterMail 16.3.6885 and mail is now correctly sent but I do get " Certificate name mismatch." in the logs which is not true according to https://www.sslchecker.com/sslchecker which has smtp.tools.sky.com as a hostname match on the certificate.

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