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Communication error while scanning

Tushar | Last updated: Sep 07, 2020 08:03AM UTC

Hi, When i run passive scan or active on my respective website, it throws communication error. This error is showing in event log. Please help me in this issue.

Hannah, PortSwigger Agent | Last updated: Sep 07, 2020 10:03AM UTC

Are you able to access the site from your machine? If you send a request to the site in Repeater, do you receive back a valid response?

Tushar | Last updated: Sep 07, 2020 03:55PM UTC

Hello Hannah, Thanks for the response. Yes i am able to access site from my machine. If i send request to repeater it gives valid response. Basically it's a windows authentication application,so i use NTLM and it works fine for me previously it throws authentication error. But now it throws communication error when run active or passive scan.

Tushar | Last updated: Sep 07, 2020 03:55PM UTC

Hello Hannah, Thanks for the response. Yes i am able to access site from my machine. If i send request to repeater it gives valid response. Basically it's a windows authentication application,so i use NTLM and it works fine for me previously it throws authentication error. But now it throws communication error when run active or passive scan.

Tushar | Last updated: Sep 07, 2020 05:04PM UTC

IN Logger it shows time out:null and my application is still response manually. All request gives valid response when use repeater. But only in active and passive not working

Tushar | Last updated: Sep 07, 2020 05:04PM UTC

IN Logger it shows time out:null and my application is still response manually. All request gives valid response when use repeater. But only in active and passive not working

Tushar | Last updated: Sep 08, 2020 06:14AM UTC

Hello Please someone help.

Hannah, PortSwigger Agent | Last updated: Sep 08, 2020 08:09AM UTC

Are you using NTLM v1 or v2? Is it working when you proxy the site?

Tushar | Last updated: Sep 08, 2020 01:21PM UTC

I am using NTLM v1 and its working fine for me

Hannah, PortSwigger Agent | Last updated: Sep 09, 2020 11:14AM UTC

Could you try disabling the embedded browser and see if that improves the situation? You can find this option under "Scan configuration > Crawling > Miscellaneous > Embedded browser options".

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