[GH-ISSUE #1233] iPhone Full Trust For Root Certificates 999 issue #1228

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opened 2026-03-03 19:49:28 +03:00 by kerem · 3 comments

kerem commented

2026-03-03 19:49:28 +03:00

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Originally created by @pedro380085 on GitHub (May 13, 2022).
Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1233

Originally assigned to: @NghiaTranUIT on GitHub.

Proxyman version? (Ex. Proxyman 1.4.3)

Proxyman 3.4.0 (30400)

macOS Version? (Ex. mac 10.14)

Mac 12.3.1

###Description
Hi there, when I am trying to enable. As soon as I complete all the steps, including the Trust Root Certificate as per the installation guidelines for iOS, I don't get any other request to be successful when using the apps. The Chrome and Safari browsers both continue to work. Just the native apps that don't work anymore.

Steps to reproduce

Launch proxyman
Monitor the logs
See 999 error

Expected behavior

Show proper return code instead of 999

Screenshots (optional)

Originally created by @pedro380085 on GitHub (May 13, 2022). Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1233 Originally assigned to: @NghiaTranUIT on GitHub. ### Proxyman version? (Ex. Proxyman 1.4.3) Proxyman 3.4.0 (30400) ### macOS Version? (Ex. mac 10.14) Mac 12.3.1 ###Description Hi there, when I am trying to enable. As soon as I complete all the steps, including the Trust Root Certificate as per the installation guidelines for iOS, I don't get any other request to be successful when using the apps. The Chrome and Safari browsers both continue to work. Just the native apps that don't work anymore. ### Steps to reproduce Launch proxyman Monitor the logs See 999 error ### Expected behavior Show proper return code instead of 999 ### Screenshots (optional) <img width="1300" alt="Screen Shot 2022-05-13 at 15 00 27" src="https://user-images.githubusercontent.com/1212753/168374015-2af96a8e-1e1a-44f2-8629-441976e9ea69.png">

kerem closed this issue

2026-03-03 19:49:28 +03:00

kerem commented

2026-03-03 19:49:29 +03:00

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Owner

@NghiaTranUIT commented on GitHub (May 14, 2022):

hey @pedro380085 if you can intercept HTTPS traffic from GoogleChrome/Safari on your iOS device, it means you set up everything correctly 👍

The reason why you get a lot of 999 SSL Errors on the Facebook, and Instagram apps is that these apps are protected by SSL Pinning. SSL Pinning is a security mechanism that prevents the app to be intercepted by any MitM apps.

There is no way to bypass the SSL Pinning unless you have their private key.

@NghiaTranUIT commented on GitHub (May 14, 2022): hey @pedro380085 if you can intercept HTTPS traffic from GoogleChrome/Safari on your iOS device, it means you set up everything correctly 👍 The reason why you get a lot of 999 SSL Errors on the Facebook, and Instagram apps is that these apps are protected by SSL Pinning. SSL Pinning is a security mechanism that prevents the app to be intercepted by any MitM apps. There is no way to bypass the SSL Pinning unless you have their private key. You can read more at https://proxyman.io/posts/2019-11-15-Can-we-bypass-ssl-pinning

kerem commented

2026-03-03 19:49:29 +03:00

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Owner

@NghiaTranUIT commented on GitHub (May 14, 2022):

Just clarify that all well-known apps, such as FB, IG, Whatapps, iTunes, AppStore, etc have SSL Pinning.

@NghiaTranUIT commented on GitHub (May 14, 2022): Just clarify that all well-known apps, such as FB, IG, Whatapps, iTunes, AppStore, etc have SSL Pinning.

kerem commented

2026-03-03 19:49:29 +03:00

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Owner

@pedro380085 commented on GitHub (May 14, 2022):

Thank you for your comment and explanation. I appreciate your time.

@pedro380085 commented on GitHub (May 14, 2022): Thank you for your comment and explanation. I appreciate your time.