1. Resolved

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   While the underlying issue is still under investigation with the network supplier, it has not occurred for months. We are closing this incident.

2. Actively investigating with supplier

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   For the past months, our network supplier has actively been investigating the issue with Cisco. Multiple steps have been taken to get closer to the root cause.

   There has been no impact at all for the past months.

   We will keep this incident up-to-date until it is permanently resolved.

3. 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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