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Understanding Error Code 4 in MDaemon

December 26, 2025 TechDistri 0 comments
Understanding Error Code 4 in MDaemon

As a part of the industry-wide initiative to migrate from SHA-1 to SHA-2 SSL certificates, MDaemon Technologies will take proactive measures to further secure its software licensing system by replacing end-point and intermediate server certificates with SHA-2 SSL certificates.

MDaemon Technologies implemented a new SHA-2 SSL certificate on its servers, effective January 20, 2015.

Non-current Windows Server 2003 and Windows XP operating systems could experience license activation or validation issues when attempting to communicate with MDaemon Technologies' software licensing system(s).

Windows Server 2012 systems that get regular updates (automatically or manually) should already have the KB2868626 update installed and probably won’t need any changes. However, it's a good idea for administrators to check that the update has been installed to make sure everything works properly.

There are four potential reasons an Error Code 4 would occur during an installation or activation:

  1. Port 443 unavailable
  2. SSL Filtering
  3. Installation is behind a proxy
  4. Microsoft Security Update 2868626 has not been applied
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