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What is a Connection Reset?

When one side of a network connection abruptly terminates that connection, that’s called a connection reset. Instead of closing through the normal connection, the reset signal ends the connection immediately. 

Under normal circumstances, the Transmission Control Protocol (TCP) determines that a connection should end with an exchange of signals between both sides. This is the confirmation that all of the data has been delivered before anything shuts down. 

A connection reset skips that process entirely, which is why it can feel abrupt to the user. 

This can happen for several reasons. For example, a server might reset a connection if it receives unexpected or malformed data. Similarly, a firewall or network device along the path might intervene and cut the connection if traffic looks suspicious or violates a rule. Sometimes a reset is simply the result of network congestion or a timeout on an overloaded server. In some cases, ISPs use resets to enforce traffic policies.

From a user perspective, a connection reset usually surfaces as a browser error, often something like “connection was reset” or “ERR_CONNECTION_RESET.” It’s distinct from a connection timeout, where the connection doesn’t fail outright but simply stops responding. If resets happen frequently, it’s worth checking whether the issue is with a specific site, your network, or something in between.