topic Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS in Real User Monitoring

Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

jcornelius — Thu, 11 Aug 2022 08:59:46 GMT

When using the Dart ssl_pinning_plugin check() method to validate certificates for a DNS, it creates a connection to retrieve the certificate info and then terminates the connection which results in the Dynatrace Flutter plugin reporting an error of -999 NSURLErrorCancelled on iOS.

I cannot find a way to exclude that from being reported as an error and as such is causing all the user sessions for iOS to have high error rates and a poor Apdex rating. We are able to exclude common response codes like 4xx or 5xx from being reported in Dynatrace but I do not see a way to exclude this particular error. Is there something that can be configured either in Dynatrace or in the Dart code to exclude this?

Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

Patrick_H — Tue, 09 Aug 2022 12:55:38 GMT

On Dynatrace cluster side everything that is a HTTP code can be excluded from treating it as error, but this does not apply to other error responses, so anything that is not a 3-digit number in the HTTP response codes range is treated as an error (negative numbers, strings,...) and currently cannot be ignored.
FYI @thomas_billi do we have an improvement for that situation planned?

Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

thomas_billi — Tue, 09 Aug 2022 14:01:27 GMT

It's definitely a limitation that we are aware of. We do not yet know how we will address it.

Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

paul_kapeller — Wed, 13 Mar 2024 08:54:12 GMT

more customizable exclusion rules are planned with OpenPipeline and the new Platform once we ingest RUM data via OpenPipeline.

Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

eddbarrientos19 — Tue, 05 Nov 2024 01:43:24 GMT

Good evening

Is there any update on how to exclude a "-999NSURLErrorCancelled" error as it is not an HTTP code.

I have a client who is presenting the same error and they are looking to exclude it

Re: Flutter plugin reporting NSURLErrorCancelled when using certificate pinning on iOS

Vivek__Reddy — Mon, 26 May 2025 12:18:32 GMT

Hi Paul,

Is there any solution for above?

Best Regards,

Vivekananda Reddy Vintha