asked on

Exchange 2010 403 4.7.0 TLS handshake failed.

Dear all,

We are having a problem with multiple companies not being able to reach any of our clients by e-mail.

We have an Exchange 2010 server with latest updates.

When an e-mail is sent the external users gets the error:

403 4.7.0 TLS handshake failed.

I have tried disabling TLS and enabling basic authentication on the receive connectors but that didn't help either.
I have checked the certificates and they are still valid.

I have used http://www.checktls.com/index.html to see if TLS works and it does.
I have tested incoming SMTP traffic with https://testconnectivity.microsoft.com and that doesn't give any errors either?

Please advise on more steps I can do to find the cause of this problem.

Thank you

ASKER CERTIFIED SOLUTION

Simon Butler (Sembee)

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Systech Admin

Also please check you Exchange certificate if its valid or not?

Itxx

ASKER

I might have found the solution. It has to do with TLS 1.2 not yet being activated and SSL3 still activated.

I'm going to try a few things tonight and update with the result and hopefully the solution.

SOLUTION

Itxx

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Itxx

ASKER

Found the problem myself with Simon's tips.