It was the third day of vaccine appointment registrations in the District, following two days of web portal problems and dropped call center calls.

But Saturday followed the same pattern, despite statements of “regret” from officials and even instructions on how to clear a web browser cache. D.C. residents still reported technical glitches on the web portal and dropped calls at the call center almost as soon as the new batch of appointments opened for scheduling at 9 a.m.

D.C. Mayor Muriel Bowser asked residents for their “continued patience.”

“Microsoft had to restart their servers. Please try to book your appointment again,” she tweeted.

Saturday’s unusual release of 3,500 appointments came after a failure to update the web portal’s eligibility requirements on Thursday. That caused the portal to turn away people under the age of 65 with qualifying medical conditions in priority zip codes on the first day D.C. said they were eligible to book an appointment.

After the Thursday snafu, DC Health announced it would offer a Saturday batch of appointments up to the same group who’d been prevented from finding shots. Friday’s appointment release was also plagued by web crashes and deep frustration from residents.

When error messages and website issues emerged on Saturday, Washingtonians once again took to Twitter with their frustration.

@MayorBowser 3rd day of trying to register my pregnant wife for the vaccine and the site has crashed after multiple confirmed appointments. If @Nike can figure out a way for 10s of millions of people to get their sneakers, #DC should be able to effectively distribute #vaccine

— Milsch (@TheRealMilsch) February 27, 2021

@fox5dc The DC Health’s vaccine site crashes again for the 3rd day in a row. Today it crashed 2 minutes after launch. I don’t understand how the DC government builds a site knowing that there will be extremely high traffic, & still not build it to handle the traffic. #DC #Vaccine pic.twitter.com/Z9V24Pl3jf

— Nerdy Eyelash #AllBlackLivesMatter (@ChoklateHulk) February 27, 2021

#DC #VACCINE #REGISTRATION: Made it all the way to “Processing…” after clicking Book before it got taken.

This stings.@wusa9 pic.twitter.com/3KtUY3AWhz

— Tom Dempsey (@KCTomDempsey) February 27, 2021

#DC #VACCINE #REGISTRATION: Made it all the way to “Processing…” after clicking Book before it got taken.

This stings.@wusa9 pic.twitter.com/3KtUY3AWhz

— Tom Dempsey (@KCTomDempsey) February 27, 2021

By about 9:45 a.m., some residents reported that the system was back online. Shortly after, DC Health announced that all the available appointments had been booked, and that new appointments would be available Thursday, March 4th.

Appointments that opened today are filled. More available for eligible residents in priority zip codes on March 4. Additional appointments for all DC residents 65+, those with a qualifying medical condition (18+), and/or members of an eligible workforce group on Friday, March 5.

— DC Health (@_DCHealth) February 27, 2021

A joint statement from Microsoft and the DC government Saturday night acknowledged the frustration people felt while trying to use the vaccination portal, and said “we acknowledge that our efforts have fallen short this week and that we must immediately work to address the issues at hand.”

This story has been updated to include response from Microsoft and the DC government.