downtime at specific locations

I have a major issue. My server has a great uptime, but I received lately complaints from clients, saying that some location cannot pick up their web site. I can barely ask my client for the tracerout, and I definetly can't ask my clients' clients to check the traceroot. Does anyone have any suggestions. Is there any program or service out there, that can checking system uptime from multiple locations around the world?

 

 

 

 

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