Is the issue happening with the latest version of Fiddler Everywhere (1.6.1 and above)?
You can share your network configuration (is there a VPN tool, additional security tooling or any kind of anti-MITM software or other MITM software that might be working on your client's station).
we've encountered error in subject of this post continued by:
"0 - A certificate chain could not be built to a trusted root authority.
ISSUER: CN=GlobalSign RSA OV SSL CA 2018, O=GlobalSign nv-sa, C=BE
This warning can be disabled by clicking Tools -> Options."
This seems to be problem with local certificate store on client computer? Not neccessarily Fiddler issue.
Using Windows 7.
How do we proceed?