Thank you for using the Fiddler Forums. My first thought is that FiddlerCore is misconfigured. Although, in order to troubleshoot this, I'll need more information. Can you provide the following items?
1. Source code for the FiddlerCore Configuration, the System proxy Registration and any Capture Events?
2. Are the requests using HTTPS/SSL? If so, which Certificate is being used?
Once I have the above information, I can try to replicate the issue.
For additional reference, see the Fiddler API documentation.
In the meantime, please let me know if you need any additional information. I look forward to your reply.
Eric R | Technical Support Engineer
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