1. Incidental hiccups due to excessive portscans

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   One of our network suppliers is experiencing incidental network hiccups, which affects your Cyberfusion services.

   These hiccups are caused by ongoing, excessive portscan attacks. Portscans usually have no impact at all. But these portscans are so excessive that they cause a single switch in our network to be overloaded - which explains why the impact is limited to hiccups.

   To permanently prevent portscan attacks of this kind, switch firmware must be upgraded. At May 8th 23:00, a firmware upgrade was attempted. In regular circumstances, this never has any impact on uptime - hence no maintenance announcement.

   In this case, the firmware upgrade did have an impact on uptime. Cisco, the switch supplier, is investigating why - with the highest priority. 

   At this time, hiccups may re-occur.  We are monitoring this situation closely.

    

   Hiccups:

   1. May 8th 19:00 - 19:02 (Amsterdam time)
   2. May 14th around 08:38

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