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Burp Collaborator could not be resolved to an IP address.

Laurens | Last updated: Dec 22, 2021 09:07AM UTC

The 'Burp Collaborator Health Check' is failing. The error message is as follows: "The capture server hostname <SUBDOMAIN>.burpcollaborator.net could not be resolved to an IP address. Ensure that an appropriate DNS entry exists for the server. The polling server hostname polling.burpcollaborator.net could not be resolved to an IP address. Ensure that an appropriate DNS entry exists for the server." I'm using Burp Pro with the default Collaborator client in a new Temporary project. Generated Burp Collaborator clients are also not available from other IP addresses and other computers. I've updated and rebooted my system, but to no avail. Do you have any idea how to solve this?

Uthman, PortSwigger Agent | Last updated: Dec 22, 2021 09:45AM UTC

Hi Laurens, If you are referring to the public Collaborator server then that appears to be down. Our development team is aware of this so we will provide an update in this thread when the issue has been fixed.

Uthman, PortSwigger Agent | Last updated: Dec 24, 2021 04:39PM UTC

Hi Laurens, Apologies for the delay in getting back to you. You may have noticed this already but this issue was fixed on 22/12 at 16:00 (UK time). Thanks for reporting it and let us know if it happens again!

RootHex200 | Last updated: Dec 01, 2023 09:58AM UTC

The 'Burp Collaborator Health Check' is failing. The error message is as follows: The capture server hostname bxcyqwpuo8kp9v2uk9kful2e359in17jbm0.oastify.com could not be resolved to an IP address. Ensure that an appropriate DNS entry exists for the server. The polling server hostname polling.oastify.com could not be resolved to an IP address. Ensure that an appropriate DNS entry exists for the server.

Michelle, PortSwigger Agent | Last updated: Dec 01, 2023 10:39AM UTC

Hi Can you tell us more about your setup, please? - Do you use an upstream proxy or are you connected to a VPN? - Can you access https://oastify.com via a browser that is not proxied via Burp? - If you copy a collaborator payload and browse to it using a browser that is not proxied via Burp, can you connect?

RootHex200 | Last updated: Dec 09, 2023 04:36PM UTC

the three question ans is yes

Ben, PortSwigger Agent | Last updated: Dec 11, 2023 09:55AM UTC

Hi, Just to clarify, you are using both an upstream proxy and are connected to a VPN?

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