Could not connect to the server. The operation couldn't be completed (NSURLErrorDomain error -999)

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Posted on by Premkumar0509

Unable to connect Business Central Onprem in IOS version - 18.2.1 and Application Version - 4.0.9292.

Has anyone encountered the NSURLErrorDomain error -999 in Business Central before?

Thanks in advance

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Dynamics 365 Business Central

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Khushbu Rajvi. 22,130 Super User 2026 Season 1 on at

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I am not sure its help or not but its worth to read it: https://learn.microsoft.com/en-us/entra/identity-platform/apple-sso-plugin

https://www.dynamicsuser.net/t/on-prem-version-not-work-with-this-app-dynamics-365-business-central-ios/68144

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KasparsSemjonovs 4,817 Super User 2026 Season 1 on at

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Seems like the Service has stopped working. Check it, and maybe restart it just in case.
If there are any errors, then restart should give some error, that can be analyzed further.

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Premkumar0509 44 on at

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@KasparsSemjonovs, I have tried to restart the Services and ISS. Still unable to fix

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Premkumar0509 44 on at

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@Khushbu Rajvi. We have not changed anything in navsettings.json,

And also tried with the removing "GlobalEndpoints" adding back by as Microsoft mentioned. Not working

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YUN ZHU 99,086 Super User 2026 Season 1 on at

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Does this problem occur when logging in on a computer?

I'm not sure if the following method still works, you can try it.

Dynamics 365 Business Central: How to access Business Central on mobile or tablet devices without Mobile App (Only use browser)

https://yzhums.com/11003/

Thanks

ZHU

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Premkumar0509 44 on at

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@YUN ZHU , It's working in PC, Andriod, and IOS Browser. The issue is with only IOS Business Central App

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CU07010248-0 2 on at

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same issue.

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