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Birthday attacks against Transport Layer Security (TLS) ciphers with 64bit block size Vulnerability (Sweet32)

Ann Marion Fernandez 0 Reputation points
2026-01-28T10:58:37.1866667+00:00

Hi

Recently deployed in server this vulnerabilities. Since then the email delivery in SSRS is not working. Can someone help with this issue? This is the error message.

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SQL Server Reporting Services
SQL Server Reporting Services

A SQL Server technology that supports the creation, management, and delivery of both traditional, paper-oriented reports and interactive, web-based reports.

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  1. Shruti Dhruv 875 Reputation points Microsoft External Staff Moderator
    2026-01-29T09:05:47.9966667+00:00

    Hi Ann,

    Welcome to Microsoft Q&A Forum!

    This is the standard SSRS “wrapper” error. It does not tell the real cause. After Sweet32 remediation, this means TLS negotiation failed when SSRS tried to talk to the SMTP server.
    The real reason why the error occurs lies in the SSRS logs.

    Check the log file:
    C:\Program Files\Microsoft SQL Server\MSRS*\Reporting Services\LogFiles\ReportServerService*.log

    If you see key words like:
    SMT, TLS, SSL, STARTTLS, connection was forcibly closed, authentication failed.
    All of these indicate TLS handshake failure, not an SSRS bug.
    Refer- https://windowsreport.com/ssrs-not-sending-emails/

    If this still doesn't help, try to attach the log file so that we can assist you better.

    Thank You
    Shruti

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