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520 Origin Error

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From my C# WinForm app, I am getting "(520) Origin Error" a lot this morning. Is server overloaded or has something changed? I get the error when I call to AUTHENTICATE. 2 out of 10 it would go through fine without error. After Authenticating I VALIDATE the session, and I get the same error again. 

HttpWebResponse Error in https://ciapi.cityindex.com/TradingAPI/session/ : The remote server returned an error: (520) Origin Error.


I also tried from Postman, randomly I get the same error, may be 1 in 10. Any idea?

Postman Error:


Error 520

Ray ID: 66dbd4ac2cf32b77 • 2021-07-12 17:01:24 UTC

Web server is returning an unknown error








What happened?

There is an unknown connection issue between Cloudflare and the origin web server. As a result, the web page can not be displayed.

What can I do?

If you are a visitor of this website:

Please try again in a few minutes.

If you are the owner of this website:

There is an issue between Cloudflare's cache and your origin web server. Cloudflare monitors for these errors and automatically investigates the cause. To help support the investigation, you can pull the corresponding error log from your web server and submit it our support team. Please include the Ray ID (which is at the bottom of this error page). Additional troubleshooting resources.

Cloudflare Ray ID: 66dbd4ac2cf32b77  Your IP:  Performance & security by Cloudflare


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Hello Superee,

There was a service interruption yesterday/overnight due to frontdoor issues with Azure affecting access. This should be resolved now so when you next use the API there should be no further problems.

Apologies for any inconvenience caused.

Kind Regards, PM

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