Improving security of web services

From: Lasse Brandt <>
Date: Wed, 22 Jun 2016 10:32:27 +0000


We are currently in a process of upgrading and further securing most of our web based services. We don’t expect any downtime with these changes, neither is there any change in functionality. These changes are related specifically to our TLS configuration for HTTPS (technical information below). Plan of changes is:

22. June 2016 ( today ):
* Upgrading sandbox DAS service on:

23. June 2016:
* Upgrading sandbox DSU service on:
* Upgrading sandbox Preact service on:

27. June 2016:
* Upgrading
* Upgrading
* Upgrading
* Upgrading

28. June 2016
* Upgrading
* Upgrading
* Upgrading

29. June 2016
* Upgrading

The technical changes for this upgrade is:

* We disable support for TLSv1.0 and v1.1 and only support TLSv1.2 onwards.
* Enabling SSL stapling
* Accepted ciphers list is shortened a bit, valid ciphers is build with help of
* HSTS is already enabled, but changed from 1 year to 6 months

Finally, we are changing our certificate provider to Lets Encrypt for automation reasons.

If you experience any problems or have questions to this, please contact us on:

Med venlig hilsen/Best Regards
Lasse Brandt
Network and System Administrator

DK Hostmaster A/S
Kalvebod Brygge 45, 3. sal
1560 København V

Tlf. 33 64 60 60
Fax.: 33 64 60 66
Homepage: <>

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Received on Wed Jun 22 2016 - 12:32:27 CEST

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