How Can I Capture "Warning: ClientHello record was 514 bytes long. Some servers have problems with ClientHello's greater than 255 bytes" by Fiddler?

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Last Updated: 11 Jun 2020 10:20 by ADMIN

勇

Created on: 23 May 2020 09:56

Type: Bug Report

How Can I Capture "Warning: ClientHello record was 514 bytes long. Some servers have problems with ClientHello's greater than 255 bytes" by Fiddler?

Hi, I'm trying to capture the iCloud Create info Page from Fiddler, But it's always get error. How Can I slove it? Can you help me?

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2 comments

Eric

Posted on: 10 Jun 2020 15:56

The message about the length of the ClientHello isn't causing this problem (and should probably be removed, because almost every middlebox that had a problem with long ClientHello messages was fixed over 5 years ago).

The problem you're encountering is almost certainly caused by the fact that Apple is using Certificate Pinning for the icloud.com server. See http://fiddler.wikidot.com/certpinning

ADMIN

Nick Iliev

Posted on: 29 May 2020 08:59

Hello,

Can you confirm that you have followed the steps required to enable capturing traffic from an iOS device? See the related documentation here. Alternatively, check if you are facing this issue related to different versions of TLS. In the very same thread, you will also find that some applications are using an extra layer of security through certificate pinning (see details here).

If your issue still persist, you could send us the exact steps you are taking so that we could reproduce the issue.

Regards,
Nick Iliev
Progress Telerik

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