I Was Using FamGateway When My Gmail Suddenly Disconnected: How I Found and Fixed an Edge-Case IMAP Bug in Production

Earlier today, while testing payment flows on my own FamGateway account, something weird happened: my Gmail integration suddenly disconnected on its own. No error popup, no warning email—just a quiet red "Not Connected" status on my integrations page. I could have just pasted my password again and ignored it. But as the founder, I knew that if it disconnected for me silently, it could happen to any merchant using our platform. So I opened the server logs to find out what really broke. Here is the breakdown of what happened, the dumb bug in our code that caused it, and how I fixed it live in production.

1. Why I Use My Own Gateway Every Day

There is a basic rule I follow while building FamGateway: I have to use it myself for real payments. Not just on a local mock server with dummy numbers, but with real UPI transactions, real payment links, and real test bots.

I regularly test our dynamic UPI QR generator, instant payment links, and our Python SDK. When you use your own software daily, you notice the small annoyances immediately—latency, UX friction, or random glitches that an automated test script might miss.

2. The Glitch: An Unexpected Disconnection

Around 6:55 PM, I was testing webhook responses in my dashboard. When I opened the Integrations page to double-check my settings, my FamPay Gmail integration was showing red: Not Connected.

My first thought was: Did Google expire my App Password? Or did I accidentally change something?

For any regular user, the standard fix is simple: generate a new Google App Password, save it, and continue. But I didn't want to just patch over it. If my integration disconnected without me touching anything, there had to be a technical reason behind it.

3. Checking the Server: The Password Was Completely Fine

Instead of re-entering credentials through the browser, I logged straight into our production server via SSH to test the connection directly using PHP CLI:

The password worked perfectly. Google didn't reject the login, the mailbox opened smoothly, and all emails were accessible. That ruled out Google revoking the credentials.

So why did FamGateway mark the account as disconnected in the database?

4. Finding the Bug in the Background IMAP Worker

Next, I checked the server error logs around the exact time of the disconnect (18:57:11). I found this line:

And when I opened the background verification worker script, the issue became immediately clear:

Here is what actually happened:

Every cloud server on the internet occasionally experiences a micro-second socket drop or handshake timeout. At 18:57, Google's IMAP server briefly closed the socket connection. It was just a temporary network blip that would have resolved itself in the next 3 seconds.

However, that old UPDATE query didn't care whether the error was a permanent wrong password or a 1-second network glitch. It just saw that $inbox was false and immediately updated the database to gmail_connected = 0, locking the account out of polling until manual reconnection.

5. The Fix

The solution was simple and clean:

1. Removed the automatic disconnect: Deleted the aggressive UPDATE users SET gmail_connected = 0 query from that failure block.
2. Graceful retries: Now, if a socket drops or a timeout happens, the script simply logs the notice and lets the next 3-second cycle try again cleanly without modifying the user's account state.
3. Distinguishing true failures: The account status should only change if there is an explicit, continuous authentication rejection from Google (like an invalid password code), not a random socket reset.

I tested the change, uploaded the updated file to production, purged our Cloudflare cache, and verified that my account stayed connected and continued polling orders properly.

6. Checking the Rest of the Database

Once my account was back up, I ran a quick database check across all active merchant accounts to make sure other users weren't stuck in a disconnected state. The check confirmed everything was healthy across the cluster.

Fun story: about an hour later, a student merchant pinged me on WhatsApp saying his Gmail wasn't connecting. Because I had just spent time in the IMAP logs, I checked his setup with him. It turned out he had copied the name of the app ("FamGateway") instead of the actual 16-character generated password from Google. Once he pasted the actual password, it connected instantly.

7. What This Taught Me

Catching this bug proved to me why actively using what you build is so important. If I only looked at server metrics from a distance, this edge case might have stayed hidden for a long time, quietly disconnecting someone during a transient network blip.

Building reliable payment software isn't about pretending bugs never happen—it's about finding them quickly, fixing them properly, and being transparent about what went wrong.

If you're building a website, Discord bot, or app and want to accept direct UPI payments with zero fees, feel free to check out our developer documentation or create a free account.

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