Floyd Mayweather Jr. vs. Conor McGregor has been billed as having the potential to break the record for most pay-per-view buys, previously set by Mayweather’s 2015 win over Manny Pacquiao, which pulled in a reported 4.4 million buys.

Unlike Mayweather vs. Pacquiao, which had no options to watch the event online, Mayweather vs. McGregor is being sold through services such as Sling TV, the Showtime PPV app, and UFC Fight Pass. Unfortunately, the high-demand for this super showdown is apparently too much for the UFC’s servers to handle. Social media is currently filled with a stream of customers who are upset that they’re unable to order the PPV.

Due to overwhelming traffic you may be experiencing log in issues. This will be resolved shortly. — UFC Fight Pass (@UFCFightPass) August 27, 2017

So much for buying early. pic.twitter.com/LeLHvSB4Ab — Steven Marrocco (@MMAjunkieSteven) August 27, 2017

Apparently the stream itself is not working for some, including former UFC fighter Sarah Kaufman.

Pretty sure I want my money back! What is happening with the stream from @UFCFightPass?! — Sarah Kaufman (@mmasarah) August 27, 2017

When Mayweather fought Pacquiao, there was outages reported when trying to order through cable companies. Apparently service has been restored, which will be a huge sigh of relief for those buying this card at the last-minute.

Read: Mayweather vs. McGregor live streaming undercard and PPV results, discussion, round by round coverage