Time: October 9, 2017 23:44:00 (CEST)
[UPDATE 00:03 CEST]

The cause of the issue has been traced to a software error on one of our high-volume routers. The issue has since been cleared and full connectivity is now restored.

If you are still experiencing issues at this time, please contact our Support department.

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Dear LeaseWeb Customer,

We are currently experiencing connectivity issues in part of our network in our AMS-01 datacenter. The following network prefixes might be affected:
37.48.98.0/23
95.211.94.0/23
95.211.168.0/21
95.211.184.0/21
95.211.192.0/21
95.211.224.0/21
95.211.240.0/22
95.211.250.0/24
185.17.184.0/23
185.17.186.0/23
37.48.100.0/23
2001:1af8:4020::/44
…………
89.144.18.0/24
103.41.176.0/23
179.43.174.128/26
212.7.198.0/24
212.114.56.0/23

We are in the process of troubleshooting the issue further and will update you shortly.