Need help, relate to HTTPS-CLIENT-SNIHOSTNAME

[Dee]

Hi everyone,

I have 2 PC, PC#1 using windows server 2003, and PC#2 using windows 8.1. i'm using fiddler2 and already enabled 'decrypt HTTPS traffic'. when i capture the log while browsing https://dropbox.com. unfortunately, i see differences between the captured session from PC#1 with PC#2. 

On PC#2 show the information about HTTPS-CLIENT-SNIHOSTNAME, but on PC#1 not.

(capture logs screenshot for PC#1 named 'dropbox from win 2003.png' and for PC#2 named 'dropbox from 8.1.png').

 My questions:

1. could anyone explain to me, why PC#1 not showing HTTPS-CLIENT-SNIHOSTNAME info?

2. is there any relation about pc operating system with this issue?

 thanks before.

[Eric Lawrence]

Hi, Dee--

TLS Extensions (including the Server Name Indication extension) were not introduced into Windows until Windows Vista. As a consequence, it's not surprising that you see a SNI sent from Windows 8.1 but not from Windows 2003 (which predated Vista).

You would also not see SNI if the client was using only SSL3 (because TLS extensions are only sent when TLS is enabled).

Regards,
Eric Lawrence
Telerik

 

 

[Dee]

Hi Eric,
Thanks for your help and information.