Black Friday is now possible from the comforts of your living room -- but only if retailers’ websites are functioning properly. Some frustrated shoppers are finding that’s not the case.

In a year when digital sales are soaring, several big-name chains have reported issues with their online shopping systems. J. Crew reported on Twitter late Friday morning that it was experiencing “some technical difficulties” as buyers flocked to its site for 50 per cent off everything deals. Lululemon Athletica Inc. said on Facebook late Thanksgiving that it was “working hard to get the dot com running smoothly again.”

Spokesmen for the retailers didn’t immediately reply to requests for comment.

Even Walmart Inc., the world’s biggest retailer, reported issues amid higher than expected web traffic. The big-box store -- which saw some of the biggest online-sales increases in the week leading up to Thanksgiving -- reported sluggishness before the holidays even began.

“Due to extremely high demand for our Black Friday deals Wednesday night, our site experienced some delays shortly after our event began online,” Walmart spokesman Danit Marquardt said in a statement. “Many customers were still able to check out smoothly, and we were able to quickly fix the issue.”

According to Adobe Analytics, as of 10 a.m. Friday, US$643 million has been spent online, up about 28 per cent year on year. Digital spending is on track to exceed US$6.4 billion on Friday -- maybe even surpassing last year’s Cyber Monday totals, it said.

--With assistance from Matthew Boyle, Hema Parmar and Sandrine Rastello.