TLS handshake

Hi,

For few days i get information on FortiMail

TLS handshake

Problem sending the message to the recipient, only after 3 attempts the fortimail server sends

Staff & Editor

Hello ciadam,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

Stephen Gerner

Fortinet Community Team

Stephen_G - Fortinet Community Team

Staff & Editor

Hi Adam,

typically this is a certificate related problem. Either your FortiMail or the other server will not trust the other node's certificate.

More technical information:

Check whether your FortiMail certificates are expired or otherwise invalidated.

with openssl you can check about the other certificate.

openssl s_client -connect theothermail.server:25

openssl s_client -starttls smtp -connect theothermail.server:25

one of them should give some good output about the servers certificate.

Using that same error message in a search engine of choice, like 403 4.7.0 tls handshake, will give you a bunch of more results.

It does sound like either FortiMail or the other webserver are not supporting the same TLS version.

Best regards,

Markus

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