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?