Request Failed With Status Code 504 or Visit Web Browser Gmail Google

title: Request Failed With Status Code 504 or Visit Web Browser Gmail Google
description: Troubleshoot the Request failed with status code 504 error for Gmail accounts connected to SalesBlink.

Overview

A 504 error is a gateway timeout, meaning SalesBlink attempted to connect to Google's servers but did not receive a response in time. In the context of Gmail accounts, this typically happens when Google has flagged the account for suspicious activity or the account is being rate-limited, causing the connection to time out rather than complete normally.

How to fix it

Work through the steps below in order. Stop as soon as the error is resolved.

Step 1: Make sure you are signed in to the correct Google account

Before anything else, confirm you are signed in to the specific Google account that is showing the error in SalesBlink. If you manage multiple accounts, sign out of all others and sign in to only the affected one.

Step 2: Visit the DisplayUnlockCaptcha page

While signed in to the affected account, go to https://accounts.google.com/b/0/DisplayUnlockCaptcha.

Click Continue. This tells Google that the recent access attempts from third-party apps like SalesBlink are authorised by you.

Note: If the DisplayUnlockCaptcha page does not load or shows as unavailable, skip it and move to Step 3.

Step 3: Refresh your app password

If the error persists after Step 2, refresh your authentication credentials:

1. In your Google account, go to Security settings.
2. Turn 2-Step Verification off, then turn it back on to reset the settings.
3. Delete any existing app passwords previously created for SalesBlink.
4. Create a new app password for SalesBlink and copy it.
5. Go back to SalesBlink, open Outreach → Email Senders, find the affected account, and paste the new app password into the credentials field.
6. Click Verify your account to confirm the update.

Step 4: Reduce your daily sending limit

1. In SalesBlink, go to Outreach → Email Senders and open the affected account.
2. In the general settings, reduce Messages Per Day to 40 or lower.
3. Click Save.

If you see an error when saving, wait 24 hours and try again.

Why does this happen?

This error can occur when a Gmail account is being pushed beyond its comfortable sending thresholds. Gmail accounts are primarily designed for personal and business communication, not high-volume outbound campaigns. If you regularly hit this error, consider:

• Warming up the account by sending no more than 30 emails per day for 1 to 2 weeks before scaling up.
• Spreading your sending volume across multiple inboxes rather than concentrating it on one account.

Still seeing the error?

If the issue continues after completing all steps above, contact SalesBlink support with the affected email address and a description of where in the process you are getting stuck.

Updated on: 18/08/2026