Re: Intermittent AppSheet sync errors

harrikirik

Hei all!

Today (19.06.2025) and yesterday, our AppSheet app started experiencing sync errors - based on the AppSheet Performance Analyzer, some API calls take 20 seconds and then fail. And then the next ones complete in 0.5-2 seconds successfully.

Our AppSheet app is backed by a SQL server running in Google Cloud, but I do not see any issues there - the CPU, memory, and read/write look within optimal limits.

Is anyone else experiencing Intermittent sync errors these past days?

farishisyam

Hi,
We also have some application that is backed by SQL Server from Azure, and we experience intermittent connection to the SQL Server for the past few days also.
This is our Error message
"Error: Data table is not accessible due to: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 35 - An internal exception was caught)."

Admins please help.

harrikirik

Status update

It seems to be better today, no failures yet.

AppliSuite

@Jana_Mandic , @Mike_Procopio

From last week to this week, the app has been intermittently slow. Synchronization delays are obvious. Also, adding and updating data can take a surprisingly long time.

We have received information that this phenomenon does not occur all day, but at certain times of the day. It seems that the operation becomes particularly slow around 5:00 PM Japan time. In UTC, it is around 8:00 AM.

The frequent server downs that occurred until last month have disappeared, but the delays in synchronization and data processing are just as serious as the server downs. This defect is causing automations that are not executed, which is disrupting business operations.

hien_nguyen

Same problem from Vietnam.

Please check and resolve it asap.

Thanks

Denzil_Snyman

Same in South Africa, all my client PDF automation bots are timing out, they spiked from 45 seconds successful to all 120 second timeouts consistently.

Steve

Please contact AppSheet Support for help with this.

Adam_Stevens

Hello,

Thanks for bringing this to our attention. We did have an increase some sync request latencies late last week, specifically originating from APAC, due to higher volume than usual. We've looked at some scaling factors and made some adjustments and are back to baselines at peak volume. We're taking some additional steps over the next few days as well to prevent reoccurrence of long tail latency increases

AppliSuite

Hi, @Adam_Stevens

Thank you for the prompt response and for investigating the sync latency issues.

However, I would like to respectfully reiterate our request regarding incident communication. While we're grateful for the resolution, incidents like this sync delay should ideally be communicated through the Google Workspace Status Dashboard in real-time.

Even though this may not have been classified as a "major outage," the prolonged sync delays significantly affected our daily operations, Bot executions, and overall workflow efficiency.

Could you please consider updating the incident reporting criteria to include performance degradations like sync latencies on the Google Workspace Status Dashboard?

Thank you again for your attention to this matter and for the technical resolution.

@Jana_Mandic , @Mike_Procopio

harrikirik

Hei Adam!

Thanks for the transparent update—it was very helpful for our own client communication and work planning.

Just to provide some data from our side, we can confirm that things looked stable on Friday. We've been out for a long weekend due to national holidays here in Estonia (Victory Day and Midsummer), but upon returning today, we are observing some elevated API latency again.

Happy to provide specific request IDs or timestamps if it would help your investigation. Thanks again for looking into it.

KON_TROLL

All our apps have suddenly sync issues today. Among all users. 10 different apps. Is this related? We also have SQL (microsoft running on Goggle Cloud). Here is the error. We have no issues using MS SQL server to access the DB. Here is the error message we now get. (PS: Unstable, somtimes it works)

LucaPoggi

Hi,

same setup as yours (microsoft sql server on Gcloud), same error.

There have been an update to the list of IP addresses used by Appsheet:, look at this announcement:

https://www.googlecloudcommunity.com/gc/Announcements/Updates-to-AppSheet-IP-addresses-supported-for...

Updating the list of authorized IPs in the Cloud SQL console solved my connection issues, hope will be the same for you

harrikirik

I also just-in-case checked my IP white-listing on the SQL server-side -> all the IPs are there already.

harrikirik

@Adam_Stevens Any updates on this issue? In the Performance Analyzer we still have intermittent issues, followed by slots of time during which everything works fine.

Aurelien

Happening again here in France @Adam_Stevens @lizlynch

All apps using CloudSQL are down.

Gilbert_mart

Hi,
We’ve been facing the same persistent sync issues for over a week now (mostly since last Wednesday). Users get “Couldn’t connect to server” errors, and even when the sync goes through, it takes a very long time. Often, the sync progress decreases slightly, then stalls, requiring users to retry manually.
We’re based in France and also use Cloud SQL.
Thank you for any updates or insights on this issue.

Aurelien

@lizlynch @Adam_Stevens is it possible to get an update about this?

It seems to work again, but I'm afraid that it goes down again without any further information.

I've told my customers not to use the application in the meantime, but this is highly annoying for users, as I reserve the use of Cloud SQL for critical business apps (example: legal, inspection, and so on).

Can you please keep us updated when the situation is fully solved on your side.

Many thanks in advance for considering

E_Hagen

+1 Just started getting the sync errors today as I am developing a new app, worked great until 30-60 mins ago. Though I did notice that entering some data to test went ok earlier for sync but took a long time to actually showup in the excel sheet, normally takes less than a minute to see changes in excel but this took longer than 5 for sure.

FYI -

Running excel sheets on Sharepoint

Also Microsoft is not showing on data source list -

harrikirik

Hei!

Any updates?

We are still getting these issues. Also, this morning we started getting the same issue when opening the app, which confused app users (our technicans who visit client installations) and created delays in our service.

Aurelien

Hi

Just out of curiosity, which country are you located?

harrikirik

Hei @Aurelien !

Our AppSheet app is in the AppSheet US region, but our users are in Estonia. The SQL server (Google Cloud MySQL), where we keep our data, is in "europe-north1-c".

Aurelien

Hi @lizlynch @Adam_Stevens @Arthur_Rallu

We are facing an annoying situation. I just spent one more hour with the support, who asked me to follow a scenario that I already followed multiple times.

Here it is:

checking IP address
refreshing data source credential
reconfigure tables in editor
sign-out, clear browser cache (why?!)

Each time, it seems to work at the moment, but when performing a slighly elaborated operation in the app such as adding multiple rows at once for example (not even refreshing in the meantime), the connection breaks again and we get the message "can't connect to the server".

My users are being blocked for almost one week now.

Can you confirm you are working on it? It would bring peace to the mind, rather than the silence. I'm available in PM if you need further information.

Tickets are:

9-1288000039145 - July 2nd
0-8907000039181 - June 28th
3-6997000038721 - June 26th

Thank you for considering.

attn @Gilbert_mart

harrikirik

Hei!

Got an answer from AppSheet support yesterday.

The first thing they suggested was to update the AppSheet IP addresses in the SQL server whitelist.

I recently double-checked them based on @LucaPoggi's advice. But I had all of the ones listed at https://www.googlecloudcommunity.com/gc/Announcements/Updates-to-AppSheet-IP-addresses-supported-for...

Support sent me this page. And said, "We have recently updated our IP lists." - https://support.google.com/appsheet/answer/10104492?hl=en&sjid=12354993318331864614-NC

This has a whopping 91 IP addresses. My SQL server whitelist did not have all of them. I added all of these, even the regions I most likely should not need.

I'll let you know if this fixes it.