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Old software that requires TLS 1.0

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Joe
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Joe asked on 30 Jul 2019, 08:38 AM

Please forgive me if this has been addressed elsewhere but I cannot find anything to help....

I have been pointed in the direction of Fiddler after running into problems using the IIS SEO Toolkit, which does not work if a site does not have TLS 1.0 enabled. The original thread can be seen at https://forums.iis.net/t/1236833.aspx?IIS+SEO+Toolkit+Not+Crawling+Sites+w+TLS+1+0+Disabled+.

Fiddler is suggested as a cure for this problem but I am not having any luck getting it to allow the crawler to run. I have used the following code in the custom rules:

 

if (oSession.HTTPMethodIs("CONNECT") && oSession.HostnameIs("www.yourdomain.com")) { 
  oSession["x-OverrideSslProtocols"] = " ssl3;tls1.0;tls1.1;tls1.2";
}

 

The aim is to allow Fiddler to act as a proxy so that the IIS software can use TLS 1.0 to speak to Fiddler, which can then use TLS 1.1+ to access the website. 

Is there a Fiddler genius who can help make this work? I know that you will be doing a lot of people a huge service.

Many thanks,

Joe

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Eric R | Senior Technical Support Engineer
Telerik team
answered on 01 Aug 2019, 05:39 PM
Hi Joe,

What version of Windows are you using? Note that Fiddler 4 can't use TLS1.1+ on Windows Versions prior to Windows 7/Server 2008 R2 because they only offer TLS 1.0. More information is available at the Fiddler and Modern TLS Versions blog post.

If you're on a new version of Windows, ensure the Allow Remote Computers to Connect checkbox is set using Tools -> Fiddler Options. See the Using Fiddler as a Reverse Proxy documentation for more information. 

Please give these options a try and if the issue still persists can you provide the output of your Fiddler Log tab and an Export a Session Archive Zip? Let me know. Thank you and I look forward to your reply.

Regards,

Eric R
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Joe
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answered on 02 Aug 2019, 08:03 AM

Thank you Eric - I will give that a try. It is actually Windows being run on a Macbook (using Parrellels) but I don't think that should make any difference? Windows is all up to date though.

Am snowed under today but will let you know how I get on.

Thanks again,

Joe

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Eric R | Senior Technical Support Engineer
Telerik team
answered on 06 Aug 2019, 03:48 PM
Hi Joe,

I agree. I don't believe the use of Parallels would make a difference since the Hypervisor usually operates as a stand alone computer.

Please let me know how the Allow Remote Computers to Connect option works for you. Thank you and I look forward to your reply.

Regards,

Eric R
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Joe
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answered on 12 Aug 2019, 02:28 PM

Hi Eric,

Sorry for the ridiculously slow response to your help. I have been struggling to find time to look at this again. 

I have, however, just enabled the 'Allow Remote Computers to Connect' option and it still fails. I was hoping that the tick box may be enough but not sure if I need to follow the rest of the instructions on the reverse proxy page?

I have exported the session but not sure how I can share that with you?

Thanks again for your help / interest.

Joe

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Eric R | Senior Technical Support Engineer
Telerik team
answered on 13 Aug 2019, 01:50 PM
Hi Joe,

Unfortunately, I am not sure that following the instructions on the Reverse Proxy page will be helpful. Since Microsoft has stopped supporting the IIS SEO Toolkit and it is out of our knowledge competency, my only recommendation is to use a different crawler. However, I have provided a list of crawlers below that might be useful. 

Screaming Frog

Sistrix

Deep Crawl

I hope this helps. Please let me know if you need any additional information. Thank you for using the Fiddler Forums.

Regards,

Eric R | Technical Support Engineer
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Eric R | Senior Technical Support Engineer
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