{"Error":"CONNECTFAILED undefined"}

Question

{"Error":"CONNECTFAILED undefined"}

JE28-DM 0

I Could not log into my outlook account, pls help

"Error":"CONNECTFAILED undefined"}

this error pops up each time

JE28-DM 0 Reputation points

2025-12-27T02:46:48.5633333+00:00

internet is fine and my other outlook accounts can be accessed correctly
Niraj Patel 0 Reputation points

2025-12-27T03:39:35.9466667+00:00

Outlook is failing to sign in because it cannot connect to Microsoft’s login servers. This is a connection problem, not a password or Outlook bug.

The most common reason is that the internet connection, firewall, antivirus, proxy, or VPN is blocking Microsoft 365 login services. This often happens on office or secured networks.

Other possible reasons are outdated security settings on Windows, especially TLS being disabled, a corrupted Outlook sign in cache after a password change, incorrect system date and time, or an outdated Office version.

To quickly identify the issue, try signing in to Microsoft in a web browser. If it does not open, the network is blocking the connection. If it opens, the problem is with Outlook on the computer.

In many cases, connecting to a mobile hotspot and signing in works. If it does, the original network needs to allow Microsoft login traffic.

Once connectivity is restored, Outlook will sign in normally.

1 answer

Your answer

JE28-DM 0 Reputation points

2025-12-27T02:46:48.5633333+00:00

internet is fine and my other outlook accounts can be accessed correctly
Niraj Patel 0 Reputation points

2025-12-27T03:39:35.9466667+00:00

Outlook is failing to sign in because it cannot connect to Microsoft’s login servers. This is a connection problem, not a password or Outlook bug.

The most common reason is that the internet connection, firewall, antivirus, proxy, or VPN is blocking Microsoft 365 login services. This often happens on office or secured networks.

Other possible reasons are outdated security settings on Windows, especially TLS being disabled, a corrupted Outlook sign in cache after a password change, incorrect system date and time, or an outdated Office version.

To quickly identify the issue, try signing in to Microsoft in a web browser. If it does not open, the network is blocking the connection. If it opens, the problem is with Outlook on the computer.

In many cases, connecting to a mobile hotspot and signing in works. If it does, the original network needs to allow Microsoft login traffic.

Once connectivity is restored, Outlook will sign in normally.

Answer 1

Dear @JE28-DM,

Thank you for reaching out to the Microsoft Q&A forum. I’m happy to assist you.

As @Niraj Patel mentioned, this issue may be related to a server or internet connection problem, or possibly a corrupted Outlook profile. To begin, please try signing in through Outlook on the web to check whether the problem occurs there as well.

If the issue also occurs on Outlook Web

This suggests your network connection may be the cause. In that case, please try the following:

Switch to a different network (for example, from Wi‑Fi to mobile hotspot).

Turn off any VPN:

Windows Settings > Network & Internet > VPN > Disable any active VPN
Also toggle off “Allow VPN over metered networks.”

User's image

Temporarily disable your firewall and Windows Security to test the sign‑in.

Visit this link for more details: Firewall and Network Protection in the Windows Security App - Microsoft Support
Please remember to enable both again immediately after testing.

Disclaimer: Turning off Windows Firewall/Defender reduces device protection, so only do this briefly for troubleshooting.

If Outlook Web works normally

Then the issue is likely related to Outlook on your computer. Please try the following steps:

Enable TLS 1.2

Type Internet Options in the Windows search bar and open it.
Go to the Advanced tab.
Scroll down and make sure “Use TLS 1.2” is checked.
Click Apply > OK, then restart your computer.

Clear Outlook credentials

Search for Credential Manager and open it.
Go to Windows Credentials.
Under Windows Credentials and Generic Credentials, delete any entries related to Outlook, Office, or Microsoft Accounts.
Restart the device and sign-in again.

Other recommendations

Update Outlook to the latest version available and repair an Office application:

Visit this link for instructions to check for Outlook's updates and repair an Office application:

Check for updates in Outlook - Microsoft Support | Repair an Office application - Microsoft Support

Re-install Office: Download, install, or reinstall Microsoft 365 or Office 2024 on a PC or Mac - Microsoft Support

I hope this information is helpful. If you need any further assistance, please feel free to reach out. We are here to help. Thank you very much for your understanding and cooperation.

If you found the answer useful, please click "Accepted Answer" and kindly give it an upvote.

If you have any follow-up questions, feel free to click "Comment" to continue the discussion.

Note: To receive email notifications related to this thread, please follow the steps in our documentation to enable email alerts.

Anonymous

2025-12-30T02:19:28.4366667+00:00

Hello @JE28-DM,

I am writing to see how things are going with this issue. Have you had a chance to check the replies provided? Any update would be appreciated.

Please feel free to let me know if there’s anything I can assist you with.

I look forward to hearing from you soon.

Wish you have a great day.

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{"Error":"CONNECTFAILED undefined"}

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