Yes, Fiddler can capture traffic from nearly anything. However, services that run inside a different user account than the Fiddler instance (e.g. the Network Service account) must be configured manually to proxy their traffic.
How is the traffic in question being sent?
For instance, if it's sent by a .NET client, http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/ConfigureDotNETApp
Or, if it's coming from WinHTTP: http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/ConfigureWinHTTPApp
Or are you attempting to capture inbound
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