Constant CONNECT_BUDGET 

const CONNECT_BUDGET: u32 = _; // 16_777_216u32

How much the connections of a session which get established hold for the client together. Their data moves from the byte budget of the client into this one, so that connections to a port which does not answer, which the connect timeout could take long, do not stop the others. Once it is used up, connecting streams stop taking their data, which then stays in the byte budget of the client and may stop reading the client like any stream which does not take its data. Any number of connections get established at once, like with CRI-O.