Hi Thomas,

Yes. It looks like this version 5.78 requieres the zlib1.dll to be present to run. The release notes document the fact that win32 openssl was built with zlib and zstd support. I just compiled zlib 1.3.2 with GCC x64 and dropped the generated zlib1.dll under "C:\program Files (x86)\stunnel\bin" and the binaries openssl.exe, stunnel and tstunnel.exe run fine. It looks like the new ZLIB1.DLL dpendency was missed from the installer package. Surely Michal will inmediatamente release a fixed installer.

Regards,
Jose A. Diaz


On Thursday, April 9, 2026 at 02:34:22 PM GMT-5, Thomas Eifert via stunnel-users <stunnel-users@lists.stunnel.org> wrote:



This is on Windows 10.  Re-installed version 5.77 and all is okay again.

On 4/9/2026 12:26 PM, Thomas Eifert via stunnel-users wrote:
>
> I couldn't install or run the new version.  Please see the attached screenshot with the error
> message.
>
>
> On 4/9/2026 10:10 AM, Michał Trojnara via stunnel-users wrote:
>>
>> Dear Users,
>>
>> I have released version 5.78 of stunnel.
>>
>> ### Version 5.78, 2026.04.09, urgency: MEDIUM
>> * Security bugfixes
>>   - OpenSSL DLLs updated to version 3.5.6.
>> * Bugfixes
>>   - Fixed WIN32 transfer() loop errors with OOB TCP.
>>   - Fixed a memory leak introduced in version 5.73.
>>   - Build fix for systems without timegm()
>>     (thanks to Jose A. Diaz and Shubham Gupta).
>>   - Fixed a startup crash when both global (default)
>>     and service-level lists of values are configured
>>     for an option.
>> * Features
>>   - Support for zstd and brotli compression with OpenSSL 3.2
>>     and TLS 1.2 or older.
>>   - WIN32 OpenSSL build with zlib and zstd support.
>>   - Support for new "options" parameter values.
>>   - Less bloated errors on an invalid configuration file.
>>   - Documentation updated from Pod to Pandoc Markdown.
>>   - Removed support for OpenSSL versions older than 0.9.8.
>>     The final update for the OpenSSL 0.9.7 branch
>>     (0.9.7m) was issed on 23 Feb 2007.
>>
>> Home page: https://www.stunnel.org/
>>
>> Download: https://www.stunnel.org/downloads.html
>>
>> SHA-256 hashes:
>> 8727e53bb8b7528f850327a2a149158422c02183bc120d1d733cc65b1e2c349d stunnel-5.78.tar.gz
>> 541700197ce2e03dd86b343d9cbf6434359cca9f44e6927fde1d2c76c355c3e6 stunnel-5.78-win64-installer.exe
>> b585d0828165d2e317f3956f2657fa6fb265b34b3ff49181bf561acd8eea2500 stunnel-5.78-android.zip
>>
>> Best regards,
>>     Mike
>>
>>
>> _______________________________________________
>> stunnel-users mailing list -- stunnel-users@lists.stunnel.org
>> To unsubscribe send an email to stunnel-users-leave@lists.stunnel.org
>
>
> _______________________________________________
> stunnel-users mailing list -- stunnel-users@lists.stunnel.org
> To unsubscribe send an email to stunnel-users-leave@lists.stunnel.org

--
Attention: This message and all attachments are private and may contain information that is confidential and privileged. If you received this message in error, please notify the sender by reply email and delete the message immediately.


_______________________________________________
stunnel-users mailing list -- stunnel-users@lists.stunnel.org
To unsubscribe send an email to stunnel-users-leave@lists.stunnel.org