TESCO'S groceries app and website was down for three hours as thousands of customers said they were unable to complete their shop.
Shoppers claimed they were locked out from 5.48pm this afternoon.
And two hours later the number of reported outages with the app and website had reached 2,973.
The issue seems to have been sorted around 8.30pm.
That didn't stop customers taking to Twitter to vent their rage.
"Tesco, your website isn't working can't load any pages and can't login. Same error message," one shopper posted.
"I tried to search for groceries and just got an error message…" said another.
A third, who trying to finish her online order ahead of her delivery slot tomorrow, tweeted Tesco to find out why she couldn't complete it.
"Trying to complete my order for delivery in morning but continue to get error?" they said.
Tesco's Twitter account responded: "Hi there, the website and app are both down at the moment I am afraid, we are aware of the issue and its currently under investigation as a priority, sorry for the inconvenience caused."
Another customer wrote: "And how long will this take to fix? I've just gone on to amend my order for tomorrow, which as a single parent with no car is very much needed, and obviously can't. I shan't be happy if I can't sort it this evening!"
"Tesco, what is happening with your website, you say it was broken then mended. Can’t get on to amend my order for tomorrow, not good enough," shared a second.
Meanwhile, a third shopper shared screen shots of error messages and tweeted: "Tesco, any idea when the site will be up and working again?"
Agnieszka said: "When will your app and website be working? Delivery tomorrow and need to finish my order!"
A Tesco spokesperson said: "We have fixed a technical issue that impacted some of our customers using our website and app this evening. We are sorry for any inconvenience this caused."
Tesco's app and website went down in June, leaving hundreds of customers unable to complete their shopping.
Over 500 complaints had been logged on outage detection site Downdetector.
The supermarket giant was made quickly aware of problems and apologised to shoppers for the inconvenience.
Customers were met with blocked pages and error messages trying to log on to Tesco's online pages.
A Tesco spokesperson said at the time: “We’ve fixed a technical issue that briefly impacted a small number of customers using our website and app this afternoon. We’re sorry for any inconvenience this caused.”
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