I get Logged Out of my web app /web site when capturing

[Kilo]

When i capture traffic and try to load something on the page i get logged out...... when i turn capturing off and reload the page everything is fine all pages load fine .... is this a Security issue like a WAF?? a Captcha issue ? or a Cloudflare Issue?  I have tls1.0, 1.1 and 1.2 enabled

[Nick Iliev]

Hello Kilo,

 

It is hard to pinpoint what might be causing the automatic logout, but a server-side security mechanism sounds plausible. It could be that the server expects the secure communication to use a specific cipher or even newer TLS version (like TLS 1.3), which Fiddler Classic does not support, or that the server rejects communication through specific obsolete TLS ciphers (from the older versions of TLS which Fiddler Classic uses). If so, you could try Fiddler Everywhere, which supports TLS 1.3. Additionally, if you can access the server, you can check its logs for more information on what causes the logout.

 

Regards,
Nick Iliev
Progress Telerik