Del via

Connection issues to Outlook servers

Stefán Sandholt 0 Omdømmepoint
2025-09-11T11:09:56.3766667+00:00

A user is experiencing server connection issues when signing into outlook on web and in the classic client.

I've seen multiple posts about the same issue, but they are from early july and I'm assuming this has been fixed in those instances.

This is the only user experiencing the issue.

When logging into outlook on the web they get the following error (client ID, Session ID and efe are redacted by me) :
UTC Date: 2025-09-10T11:26:06.269Z

Client Id: *********************

Session Id: ********-*****-****-****-************

Client Version: 20250829003.07

BootResult: fail

Back Filled Errors: Unhandled Rejection: SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input:undefined|Unhandled Rejection: SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input:undefined|Unhandled Rejection: SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input:undefined|Unhandled Rejection: Error: 440:undefined|undefined:undefined|undefined:undefined|undefined:undefined|undefined:undefined

err: Error: 440

esrc: StartupData

et: ServerError

estack: Error: 440

at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.12026b2c.js:1:1041)

at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.12026b2c.js:1:164410

st: 440

efe: *************

In outlook classic it reports: Task ' ....@.... ' reported error (0x8004011D): 'The server is not available. Contact your administrator if this condition persists.'

Well, it persists and this administrator does not know what else to do.

  • The user is also unable to log in on other devices such as phones and tablets.
  • The appropriate license is confirmed to be applied to the users account.
  • All apps are ticked in the admin cloud.

What's been attempted so far:

  • Updated O365 through Outlook
  • Online reparation of office.
  • Mailbox has been turned to a shared mailbox and back to a user mailbox 10 minutes later.
  • License has been removed and re-added a few minutes later.

Is this still an ongoing issue for users and how come this only affects this single user in the org?

Outlook | Internet | Outlook.com | Kontostyring, -sikkerhed og -databeskyttelse
0 kommentarer

2 svar

Sortér efter: Meget nyttig
Meget nyttig Nyeste Ældste
  1. Stefán Sandholt 0 Omdømmepoint
    2025-09-16T13:59:51.3933333+00:00

    If anyone else sees this this is what solved the issue:

    Give another licensed user full access to the mailbox, let it cook for a minute, check the mailbox on the new user account. If it appears without issue, the user should be able to log on.

    In our case we had to follow this with an online repair of office and the user was yet again able to log on.

    Var dette svar nyttigt?

    0 kommentarer
  2. Diane Poremsky 8,175 Omdømmepoint Uafhængig rådgiver
    2025-09-11T13:40:37.37+00:00

    It could be a new issue. There is nothing in the service health indicating this is a widespread issue.

    It sounds like it is a problem with the mailbox itself since they can't log in to any devices, so I don't know if the support and recovery will give you any helpful information, but it's worth a try.

    The admin could open a support case with Microsoft and see if they can identify the problem or make a new mailbox for the user. Change the address on the old mailbox so you can move the address to the new one. Make the old mailbox a shared mailbox (assuming it will open as a shared mailbox). They can export the mail already in classic Outlook to a PST and import it in the new mailbox.

    Var dette svar nyttigt?

    0 kommentarer

Dit svar

Svar kan markeres som "Accepteret" af spørgsmålsforfatteren og "Anbefalet" af redaktører, hvilket hjælper brugerne med at vide, at svaret løste forfatterens problem.