Why Wait
I. Error message:
How do I configure SSL/TLS Edge Certificates to remove the following error message:
II. Summary
“Unable to connect with TLS encryption Log data: ++ Starting Swift_SmtpTransport << 220-35-236-118-198.cprapid.com ESMTP Exim 4.96 #2 Sun, 13 Aug 2023 23:37:58 -0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mautic.devced.com << 250-35-236-118-198.cprapid.com Hello mautic.devced.com [35.236.118.198] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-PIPECONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> STARTTLS << 220 TLS go ahead !! Unable to connect with TLS encryption (code: 0)
++ Starting Swift_SmtpTransport << 220-35-236-118-198.cprapid.com ESMTP Exim 4.96 #2 Sun, 13 Aug 2023 23:37:58 -0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mautic.devced.com << 250-35-236-118-198.cprapid.com Hello mautic.devced.com [35.236.118.198] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-PIPECONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> STARTTLS << 220 TLS go ahead !! Unable to connect with TLS encryption (code: 0).”
Step-by-step summary of the provided log data:
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Server Greeting: The SMTP client initiates a connection with the server (220-35-236-118-198.cprapid.com) and receives a greeting message indicating the server’s identity, version (Exim 4.96), and timestamp (Sun, 13 Aug 2023 23:37:58 -0700).
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Authorization Notice: The server informs that it does not authorize the use of the system for unsolicited or bulk email.
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EHLO Command: The client sends the EHLO command along with its domain (mautic.devced.com) to introduce itself to the server.
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Server Response: The server responds, acknowledging the client’s domain and providing a list of supported features, including message size, MIME encoding, pipelining, authentication methods (PLAIN LOGIN), STARTTLS support, and general help.
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STARTTLS Command: The client attempts to initiate a secure TLS-encrypted connection by sending the STARTTLS command.
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Server Response: The server responds with a confirmation to proceed with TLS encryption (220 TLS go ahead !!).
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TLS Connection Error: Despite the server’s approval, the client encounters an issue while trying to establish the TLS-encrypted connection, resulting in an error message: “Unable to connect with TLS encryption (code: 0).”
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Reattempt: The SMTP client repeats the same sequence of commands, possibly indicating an attempt to resolve the TLS connection issue.
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Duplicate Result: The second attempt also encounters the same TLS connection error (code: 0) while trying to establish encryption.
Detailed Summary Analysis:
The provided log data represents an SMTP communication attempt between an SMTP client (presumably utilizing the Swift_SmtpTransport library) and an SMTP server (220-35-236-118-198.cprapid.com) on Aug 13, 2023. The interaction involves the client introducing itself, the server responding with capabilities, an attempt to initiate a secure TLS-encrypted connection, and a subsequent failure to establish the TLS encryption (code: 0).
Key stages include:
- Connection initiation with server greeting and authorization notice.
- Client EHLO command and server’s feature list response.
- Client’s attempt to enable TLS encryption (STARTTLS) and server’s consent.
- Unsuccessful TLS encryption due to an unidentified error (code: 0).
As the error repeats in both connection attempts, it indicates a persistent issue. Possible reasons for the TLS connection error remain consistent with the previous analysis: misconfigured server settings, incompatible SSL/TLS libraries, firewall or network restrictions, or problems with the server’s TLS certificate.