Outlook not sending and receiving gmail emails since Feb 26, 2026

Question

Outlook not sending and receiving gmail emails since Feb 26, 2026

Val Steeves 35

As of February 26, 2026 around 6 pm CST, Outlook stopped sending and receiving from my gmail account. I get the following error message: Screenshot 2026-03-08 112721.png. I have gone into Account Settings and also into my gmail settings and tried the steps that are usggested online but it does not solve the issue. Is this related to a Windows update? If so, when will it be fixed? If not an update issue, how can I resolve this?

Thank you.

Ernie Dacho 5 Reputation points

2026-03-09T14:18:29.2733333+00:00

MS Support advised that this is a known problem. Seems the Outlook Google server is down for several days now. Google is working on it. MS is not logging a support case as this is a Google server issue.
Sang T. Le 0 Reputation points

2026-03-10T09:16:15.5033333+00:00

https://support.microsoft.com/en-us/office/onedrive-release-notes-845dcf18-f921-435e-bf28-4e24b95e5fc0#osversion=downloads
Charles Stott 10 Reputation points

2026-03-10T16:07:56.47+00:00

I have just gone through updating my pc's and laptop eith the new office updates and deleted the credentials again, this time it seems to have fixed the issue, so it was definatly a microsoft issue and this latest update seems to have fixed it.. Well looks like i spoke to soon, worked for a short time but now back to the same problem. :(
David Brewster 5 Reputation points

2026-03-11T10:21:20.8833333+00:00

I have access to three different Gmail accounts. Interestingly, only one is affected on Outlook. (All continue to work normally on iphone / ipad).
Anonymous

2026-03-11T20:19:35.88+00:00

The issue you are seeing is an Outlook bug. There is a current Known Issue with Gmail and Yahoo accounts. Please try the workaround in this article, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67.
Lionel Pickens 0 Reputation points

2026-03-12T16:27:08.84+00:00

Any updates related to this glitch?
KrisO 15 Reputation points

2026-03-12T20:52:11.1+00:00

I'm experiencing a related but distinct issue on Outlook for Microsoft 365 (Version 2602, Build 16.0.19725.20126, fully updated), issues only with Gmail related accounts.

In my case, the "Sign in via browser" prompt DOES appear. The OAuth flow completes successfully on Google's side — I authorize Microsoft apps & services with all permissions checked. However, the callback to localhost:8011 fails with ERR_CONNECTION_REFUSED.

I monitored port 8011 with netstat at 200ms intervals and found the root cause: Outlook opens an HTTP.sys listener on port 8011 when initiating OAuth, but CLOSES it the exact moment Google redirects back. The browser's callback arrives ~276ms later to a closed port (SYN_SENT with no listener).

The workaround in the known issue article (deleting Identity\Identities registry keys) does not help — the listener still closes prematurely on re-authentication.

I've exhausted all options: disabled Bitdefender firewall, cleared Credential Manager, removed all tp_google_imap_OAuth2 identity keys, revoked Microsoft access from Google Account, created new Outlook profile, uninstalled New Outlook — same result every time.

This affects all three of my Gmail/Google Workspace IMAP accounts. The netstat log clearly shows the bug is in Outlook's listener lifecycle, not in firewall/network/credentials.
Anonymous

2026-03-12T21:46:26.5166667+00:00

@KrisO

I am updating the Known Issue tomorrow morning to recommend removing the Gmail & Yahoo Credential Manager credentials as a first workaround. That is what the Outlook MVPs say is working for them most of the time. Its Step 2 in this article, https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f. I now have four of those MicrosoftOffice16_Data:OAUTH2 credentials for each account so make sure you remove all four of them. You might also have to restart Outlook a second time before it starts syncing. Please try this and let me know if it helps.

Reference Known Issue, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67
KrisO 15 Reputation points

2026-03-13T07:59:12.9166667+00:00
Hi @Anonymous ,
Thank you for the response. I've checked Credential Manager — there are currently no MicrosoftOffice16_Data:OAUTH2 entries at all (I had already removed them during earlier troubleshooting, along with the Identity\Identities registry keys).

The core issue in my case is that the OAuth callback never completes, so new credentials are never created. When I click "Sign in via browser", Google authorization succeeds, but the redirect to localhost:8011 fails because Outlook closes the HTTP.sys listener before Edge can deliver the callback.

I confirmed this with netstat monitoring at 200ms intervals:

Listener opens on port 8011 (PID 4, LISTENING)

Listener stays active while I'm on Google consent screen

The moment I click "Allow", the listener closes

276ms later Edge tries to connect (SYN_SENT) — no listener, ERR_CONNECTION_REFUSED

Since the OAuth flow never completes, no OAUTH2 credentials are ever written to Credential Manager. The workaround of removing credentials cannot help in this scenario because there are no credentials to remove.

Is the engineering team aware of this specific localhost:8011 listener lifecycle issue? Is there a fix or additional workaround being developed for cases where the callback itself fails?
Charles Stott 10 Reputation points

2026-03-13T11:59:53.14+00:00

Hello Gabe.

This fix that you have suggested dose not work. I have tried doing exactly what has been advised on all 3 desktops. After initially doing the (fix) Google mail connects to the server but when closing down outlook and restarting it fails to connect with the exact same issue.

Thanks

Charlie
M G 5 Reputation points

2026-04-02T13:57:16.65+00:00

STILL not working. March 20 update did not fix anything.
Charles Stott 10 Reputation points

2026-04-02T14:22:03.29+00:00

Mine seem to have fixed and all working agian as they should . not sure why but i did delete the reg files in the instructions earlier

4 answers

Your answer

Ernie Dacho 5 Reputation points

2026-03-09T14:18:29.2733333+00:00

MS Support advised that this is a known problem. Seems the Outlook Google server is down for several days now. Google is working on it. MS is not logging a support case as this is a Google server issue.
Sang T. Le 0 Reputation points

2026-03-10T09:16:15.5033333+00:00

https://support.microsoft.com/en-us/office/onedrive-release-notes-845dcf18-f921-435e-bf28-4e24b95e5fc0#osversion=downloads
Charles Stott 10 Reputation points

2026-03-10T16:07:56.47+00:00

I have just gone through updating my pc's and laptop eith the new office updates and deleted the credentials again, this time it seems to have fixed the issue, so it was definatly a microsoft issue and this latest update seems to have fixed it.. Well looks like i spoke to soon, worked for a short time but now back to the same problem. :(
David Brewster 5 Reputation points

2026-03-11T10:21:20.8833333+00:00

I have access to three different Gmail accounts. Interestingly, only one is affected on Outlook. (All continue to work normally on iphone / ipad).
Anonymous

2026-03-11T20:19:35.88+00:00

The issue you are seeing is an Outlook bug. There is a current Known Issue with Gmail and Yahoo accounts. Please try the workaround in this article, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67.
Lionel Pickens 0 Reputation points

2026-03-12T16:27:08.84+00:00

Any updates related to this glitch?
KrisO 15 Reputation points

2026-03-12T20:52:11.1+00:00

I'm experiencing a related but distinct issue on Outlook for Microsoft 365 (Version 2602, Build 16.0.19725.20126, fully updated), issues only with Gmail related accounts.

In my case, the "Sign in via browser" prompt DOES appear. The OAuth flow completes successfully on Google's side — I authorize Microsoft apps & services with all permissions checked. However, the callback to localhost:8011 fails with ERR_CONNECTION_REFUSED.

I monitored port 8011 with netstat at 200ms intervals and found the root cause: Outlook opens an HTTP.sys listener on port 8011 when initiating OAuth, but CLOSES it the exact moment Google redirects back. The browser's callback arrives ~276ms later to a closed port (SYN_SENT with no listener).

The workaround in the known issue article (deleting Identity\Identities registry keys) does not help — the listener still closes prematurely on re-authentication.

I've exhausted all options: disabled Bitdefender firewall, cleared Credential Manager, removed all tp_google_imap_OAuth2 identity keys, revoked Microsoft access from Google Account, created new Outlook profile, uninstalled New Outlook — same result every time.

This affects all three of my Gmail/Google Workspace IMAP accounts. The netstat log clearly shows the bug is in Outlook's listener lifecycle, not in firewall/network/credentials.
Anonymous

2026-03-12T21:46:26.5166667+00:00

@KrisO

I am updating the Known Issue tomorrow morning to recommend removing the Gmail & Yahoo Credential Manager credentials as a first workaround. That is what the Outlook MVPs say is working for them most of the time. Its Step 2 in this article, https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f. I now have four of those MicrosoftOffice16_Data:OAUTH2 credentials for each account so make sure you remove all four of them. You might also have to restart Outlook a second time before it starts syncing. Please try this and let me know if it helps.

Reference Known Issue, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67
KrisO 15 Reputation points

2026-03-13T07:59:12.9166667+00:00

Hi @Anonymous ,
Thank you for the response. I've checked Credential Manager — there are currently no MicrosoftOffice16_Data:OAUTH2 entries at all (I had already removed them during earlier troubleshooting, along with the Identity\Identities registry keys).

The core issue in my case is that the OAuth callback never completes, so new credentials are never created. When I click "Sign in via browser", Google authorization succeeds, but the redirect to localhost:8011 fails because Outlook closes the HTTP.sys listener before Edge can deliver the callback.

I confirmed this with netstat monitoring at 200ms intervals:

Listener opens on port 8011 (PID 4, LISTENING)

Listener stays active while I'm on Google consent screen

The moment I click "Allow", the listener closes

276ms later Edge tries to connect (SYN_SENT) — no listener, ERR_CONNECTION_REFUSED

Since the OAuth flow never completes, no OAUTH2 credentials are ever written to Credential Manager. The workaround of removing credentials cannot help in this scenario because there are no credentials to remove.

Is the engineering team aware of this specific localhost:8011 listener lifecycle issue? Is there a fix or additional workaround being developed for cases where the callback itself fails?
Charles Stott 10 Reputation points

2026-03-13T11:59:53.14+00:00

Hello Gabe.

This fix that you have suggested dose not work. I have tried doing exactly what has been advised on all 3 desktops. After initially doing the (fix) Google mail connects to the server but when closing down outlook and restarting it fails to connect with the exact same issue.

Thanks

Charlie
M G 5 Reputation points

2026-04-02T13:57:16.65+00:00

STILL not working. March 20 update did not fix anything.
Charles Stott 10 Reputation points

2026-04-02T14:22:03.29+00:00

Mine seem to have fixed and all working agian as they should . not sure why but i did delete the reg files in the instructions earlier

Answer 1

The issue is most likely related to recent changes in how Gmail accounts authenticate with classic Outlook, not specifically to a Windows update. There are two main areas to check and correct: Gmail’s IMAP settings and the Outlook–Google consent/connection.

Follow these steps in order:

Confirm Outlook is online and connected

In classic Outlook, look at the status bar at the bottom.
If it shows Disconnected, Working Offline, or Trying to connect…, go to Send/Receive tab > Work Offline to toggle back online.
After it shows as connected, try Send/Receive again.

Verify IMAP is enabled in Gmail Gmail must have IMAP enabled or Outlook will fail with IMAP errors.
In a browser, sign in to Gmail.
Select the gear icon > Settings.
Go to Forwarding and POP/IMAP.
Under IMAP access, make sure Enable IMAP is selected.
Select Save Changes.

If IMAP was disabled, re‑start Outlook and test send/receive.

Reconnect Gmail to Outlook with correct permissions If the Gmail account was added previously and the consent box for full mail access was not checked, Outlook can no longer sync and will show IMAP/connection errors.

For classic Outlook builds with the fix (Current Channel Version 2412 Build 18324.20168 or later):

When the error dialog appears for the Gmail account, select the Retry link.
A browser window opens for Google sign‑in.
Sign in to the same Gmail account.
On the consent screen, under Select what Microsoft apps & services can access, ensure the option “Read, compose, send, and permanently delete all your email from Gmail.” is checked.
Complete the sign‑in and return to Outlook; then try Send/Receive.

If the Retry flow does not appear or does not work, remove and re‑add the Gmail account after confirming IMAP is enabled, and during the add process make sure that same permission box is checked.

Confirm server settings if using manual configuration If the account is configured manually as IMAP/SMTP, verify the Gmail server settings match:

Incoming (IMAP):
- Server: imap.gmail.com
- Port: 993
- SSL: Required (Yes)
Outgoing (SMTP):
- Server: smtp.gmail.com
- SSL: Yes, Port 465 or
- TLS/STARTTLS: Yes, Port 587
- Authentication: Required (same username/password as incoming)

Check for other common Outlook send/receive blockers If the Gmail connection and IMAP settings are correct but mail still does not move:

Ensure there is no oversized message stuck in Outbox (especially with attachments > ~20 MB). If present, open it, remove or reduce the attachment, or delete the message, then send again.
Make sure the internet connection is working by opening a browser and visiting a site such as http://www.microsoft.com.
If problems persist only in this Outlook profile, repair the profile or create a new one using the steps in Fix your Outlook email connection by repairing your profile / Create an Outlook profile.
If Outlook itself appears unstable after recent updates, run an Office repair using Repair an Office application.

About whether and when it will be fixed For the known Gmail sign‑in/add‑account issues in classic Outlook, Microsoft has already released fixes in current channels by changing the sign‑in flow to a separate browser window. If Outlook is updated to one of the fixed builds and the Gmail account is re‑consented with full mail access and IMAP enabled, the Gmail send/receive issue should be resolved without waiting for another Windows update.

If, after all of the above, Gmail still does not send/receive in classic Outlook while it works in the browser, capture the exact error text from the Send/Receive dialog and contact Outlook support or post it in the Outlook Tech Community for further investigation.

References:

Answer 2

Sumit 44,521 Volunteer Moderator

This article should help you out:

Gmail Not Working in Outlook 365? Here's the Proven Fix (2026)

See the steps below to fix Gmail in Outlook classic during Setup:

Press Windows + S, type Credential Manager, and open it.

Click Windows Credentials.

Scroll to Generic Credentials.

Find entries starting with MicrosoftOffice16_Data:OAUTH2.

Expand each entry.

Hover over MicrosoftOffice16_Data:OAUTH2 to see the full name containing tp_google_imap_Oauth2 (these are Gmail credentials).

Click Remove for each MicrosoftOffice16_Data:OAUTH2 entry.

Remove both credentials for the affected Gmail account.

Optional: To identify the correct Gmail account before deleting:

Open Registry Editor.

Paste this path in the address bar:

Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities

Check the Identity subkeys.

The number at the beginning of the identity key matches the number in the MicrosoftOffice16_Data credential.

After removing the credentials:

Open Outlook.

Go to the affected profile.

Click Sign in via browser in the Outlook notification bar.

Sign in to your Gmail account again.

Remove access for Microsoft Apps & Services in Gmail (Fix Gmail in Outlook Sync)

Close Outlook.

Go to google.com and sign in to your Google account.

Click your profile picture in the top-right corner.

Select Manage your Google Account.

From the left menu, click Security.

Scroll to Your connections to third-party apps & services.

Select Microsoft apps & services.

Find Microsoft apps & services has some access to your Google Account.

Click See details.

Under Access you’ve given to Microsoft apps & services, click Remove all access. This should reset the Gmail in Outlook sync, and you can try again.

Select Confirm.

steve taggart 0 Reputation points

2026-03-10T15:33:42.86+00:00

Followed this procedure, but the historical emails have not synched into New Outlook. I did get them to sync in old Outlook.....Ideas?
Tuddy 0 Reputation points

2026-03-14T02:32:07.32+00:00

Thank you for posting this fix - it worked perfectly, only hiccup had to try the sign in twice to get it to work.

Windows 11, old Outlook: (Version 2602 Build 16.0.19725.20126) 64-bit
Sher Johnson 0 Reputation points

2026-03-18T19:03:58.41+00:00

When I do this, the credenital manager shows a CREDENTIAL MANAGER ERROR; an error occured while performing this action, no details. so Can't get into the dedential manager to get to generic
Anonymous

2026-03-18T19:32:30.3966667+00:00

Sher,

I put some different steps in the Known Issue article, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67. If you still cannot get Credential Manager to work correctly in Workaround 1, try the steps in Workaround 2. If anything is not clear, please let me know.

Answer 3

Sumit 44,521 Volunteer Moderator

Followed this procedure, but the historical emails have not synched into New Outlook. I did get them to sync in old Outlook.....Ideas?

So we made progress.

How are these Settings set?

User's image

steve taggart 0 Reputation points

2026-03-11T16:17:01.11+00:00

toggled all the "days of email to save", but no bueno. Old Outlook working just fine. Will just persevere with that until the next update fixes things.....thanks.

Answer 4

M G 5

Working now

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