The Federal Communications Commission is gearing up for what some are expecting to be a record public-comment period for Chairman Ajit Pai’s proposed rulemaking to roll back “net neutrality.” However, officials in the agency warn that its system may go down if hit by “malicious attacks” or a massive number of comments.

About 4 million members of the public filed comments in 2014 on the proposed rule that led to the 2015 reclassification of Internet service providers like AT&T and Comcast as Title II public utilities. The regulations allowed more stringent FCC oversight over companies that might block or inhibit access to certain types of web services by creating pay-to-play fast lanes for certain content.