A Content Delivery Network that Zebra use, Cloudflare, is currently experiencing a denial of service attack against parts of their European network.
Mitigating performance problems in AMS, LHR
— CloudFlareStatus (@CloudFlareSys) July 1, 2014
As a result, access to the Zebra Internet Services and Domaincheck websites may be intermittent until the attacks have been mitigated.
Further information can be found here: