Slack users were unable to access the team chat tool for several hours on Wednesday, after “connectivity issues” knocked the app offline.

Although service resumed later that day, it caused a disruption for users who rely on the application for communication and collaboration within the workplace. Problems were reported by users in the U.S. and the U.K., with many venting frustrations on Twitter.

Keaton Fox from Houston tweeted, “breaking: as Slack outage continues, thousands of workers are forced to actually speak to others in the office.” In Palo Alto, Calif., Chris Mutchler chimed in, “Slack is down. How is that ChatOps strategy working for you now?”

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