iOS & MacOS - http 1.1 Service Unavailable

Hello Flemming,

From your description, it seems you are running to a problem with Skype for Business. But you post this thread in Outlook category. Can I know the more information about your query please for better help you?

Meanwhile, you also can provide us some screenshots to describe the issues you have.

If the effected login office 365 for business account is a federated one, please check if the related certificate installed successfully in iOS/MacOS device.

Regards,

Rudy

On MacOs we saw the error when logging into S4B, we don't have that many Mac's.

But we have the problem when signing into Outlook, first time or when the user change password.

It's Office 365 for Business for our company.

We have over 1000 iOS devices in Intune.

Not sure about the certificate? Don't think there is one?

The user's devices are checked for compliancy with Company Portal app.

Here's screenshot's in Danish:

1	2
3	4

1:

User have new password, Outlook promt's for login.

2:

We deploy Auth app, so the user have to open that.

3:

User sign in with there email and password (ADFS)

4:

User get the http 1.1 error.

But if they Cancel, and Exit Auth with X-button, they are back in Outlook.

If they then try again, it skips login (ADFS) and goes to MFA, after that it works.

Hi DimZenDk,

Thanks for your reply and the information. Would you please try to clean the keychain up as the following steps show and check the results?

Close all the office applications for Mac.

Open Keychain Access by using one of the following methods: In “Spotlight Search,” type “Keychain Access” and then double-click “Keychain Access” in the search results. In the search box of “Keychain Access,” type “Exchange” "ADAL" and "Office", delete all the related items. Then type the domain of your account in the search box and delete the search results.

Close Keychain Access.

Re-launch Outlook for Mac.

If it doesn’t helps, may I know how it goes when signing into  outlook web app with the account in Mac?

Best regards,

Coldwell

Hi,

It's on many iOS devices, even brand new ones without iCloudID logged in, Company Portal deployed with DEP.

Also tried on a newly installed Mac, so it's not the Keychain that have left overs.

Web Outlook works fine, no problem there, it's only with app's we have the problem.

Kind regards,

Flemming

Hi Flemming,

Thanks for your reply and the related information. We need some time to do further investigation. In the meantime, I’d like to suggest that changing the default browser in Mac to do a test to see if it helps. Thanks for your understanding and time. : )

Best regards,

Coldwell

Didn't help with changing default browser in MacOS :)

Sound good, hope you find a fix :D

Hi Flemming,

Thanks for your reply. After consulting the related team, we suggest that choose one iOS/MacOS device to reset the network settings to check if the DNS resolution related issue. We’d also like to collect the iOS version and the sip address for further investigation.

In the meantime, please capture the Fiddler logs in Mac as the following article shows during the period of reproducing the issue on your Mac.

https://blogs.msdn.microsoft.com/jpsanders/2018/02/08/usinginstalling-fiddler-on-mac-os/

Best regards,

Coldwell

Done the reset of network settings too.

We have devices with iOS versions from 10.2.1 to 12.1.3

SIP address?

I'll look into Fiddler logs from my Mac, and write back.

Hi Flemming,

Sorry for my mistake, I forgot to initiate the private message with you. Please click the following link to access  the private message and send the Fiddler logs to us.

https://answers.microsoft.com/en-us/privatemessage/inbox 

Best regards,

Coldwell