Wall Street futures trading was disrupted by an outage on exchange operator CME Group’s platform, as investors returned for a session on Friday shortened by the U.S. Thanksgiving holiday.

As of 05:28 ET (10:28 GMT), the last indicated trade showed S&P 500 Futures up 0.1%. Nasdaq 100 Futures were higher by 0.2%, while Dow Jones Futures had added 0.1%.

The CME Group said in a statement that the outage was due to a technical issue at CyrusOne data centers, and that the company was working on a fix. Dallas-based CyrusOne operates more than 55 data centers in the U.S., Europe and Japan.

A host of commodities and agricultural goods contracts appeared to be disrupted by the outage, which came as volumes are anticipated to be muted during the holiday-truncated session.

Wall Street buoyed by December rate cut bets, Fed Chair speculation

The major U.S. averages have rebounded this week, aided by renewed bets that the Federal Reserve will cut interest rates next month.

Although some Fed policymakers have called for borrowing costs to remain unchanged at their current range of 3.75% to 4% due to a recent lack of fresh economic data, other officials have argued for a cut to help bolster an ailing American labor market. The Fed previously slashed rates in October and September.

According to CME FedWatch, there is now a roughly 85% chance of a quarter-point drawdown in rates at the Fed’s December 9-10 gathering, up sharply from last week.

Meanwhile, speculation over a more dovish successor to Fed Chair Jerome Powell also aided sentiment, after a report said White House economic adviser Director Kevin Hassett was the front-runner to be the next Fed Chair. Hassett is expected to largely back President Donald Trump’s demands for sharply lower interest rates.

This has helped to ease emerging fears around a possible bubble forming in the artificial intelligence boom. These concerns, driven in large part by frothy tech stock valuations, circular financing in the AI sector, and an uncertain economic backdrop, have threatened to weigh on stocks throughout the month.

All of the benchmark indices on Wall Street are on track to post declines in November.

PCE due next week

Much of the focus next week is set to revolve around a host of economic readings, which will be among the few official data points the Fed will have prior to its December meeting.

Key among these is the personal consumption expenditures price index — one of the Fed’s preferred inflation gauges — which will be published on December 5. However, delays to the release of the figures because of a record-long federal government shutdown mean that the data will only cover the month of September.

As a result, some analysts have suggested that these numbers may not be totally reflective of the current state of the American economy. Government officials have scrapped inflation and labor readings for October as well, citing a lack of time needed to collect data for the reports due to the shutdown.

WTI hit by CME outage

U.S. West Texas Intermediate crude futures were frozen after the system outage at CME Group, with traders saying they were informed of the halt just before 0300 GMT.

The contract was last exchanging hands up 0.73% at $59.08 a barrel. There was no settlement on Thursday because of the Thanksgiving holiday.

Meanwhile, front-month Brent crude futures for January, which are set to expire on Friday, had slipped by 0.1% to $63.26 a barrel. The more actively traded February contract was down 0.1% at $62.84 a barrel. Brent oil is traded on the Intercontinental Exchange, or ICE.

Hovering over moves in the Brent contract were ongoing peace talks to end the war in Ukraine, as well as an upcoming meeting this weekend of the Organization of the Petroleum Exporting Countries and its allies, a producer group known as OPEC+. Sources cited by Reuters said OPEC+ is likely to leave oil output levels unchanged and agree on a mechanism to gauge the maximum capacity of member nations.