Thank you for the reply. I'm only using their free service (limited to 2 websites) to monitor the uptime of two very cheap hosting accounts I've purchased recently. So no need to call them, because if it's a server problem they should be very busy at the moment.
But maybe someone here at WHT is using the (paid) services of 100pulse and has already some detailed information.
Hopefully the uptime readings wont be skewed when they come back online! Personally if it's been over a day and the issue is persistent, I'd be a little concerned, free account or not. Do they have a contact number to call or support e-mail?
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It's a phone number in India, but maybe I should really call them tomorrow for some information.
Because it's strange, a traceroute to 100pulse.com with the IP 188.8.131.52 and the hostname unknown184.108.40.206.defenderhosting.com seems to work fine, but their website gives this 502 Error Message:
The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /.
Reason: Error reading from remote server
Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.
UPDATE - the 100pulse monitoring service is up again!
Between April 22 to April 25 there was no monitoring for about 58 hours! But the downtime didn't have any negative effect on the uptime statistics.
No information about their downtime on their twitter account or in their support forum. I will continue using their free service but by sure I won't upgrade to their paid services after this experience.