The experimental Asterisk 22.5.1 AMI accept-path fix from section 7.3. Test servers only.
Apply in the Asterisk source tree with patch -p1, then rebuild and install the binary (make main; only main/asterisk changes).
1. main/tcptls.c: the listen backlog of Asterisk's TCP servers (the AMI among them) 10 -> 1024.
2. main/manager.c: purge_old_stuff(), which runs on every pass of the AMI accept loop and locks every session, at most once a second.

--- a/main/tcptls.c
+++ b/main/tcptls.c
@@ -880,7 +880,7 @@
 			strerror(errno));
 		goto error;
 	}
-	if (listen(desc->accept_fd, 10)) {
+	if (listen(desc->accept_fd, 1024)) { /* VICIfast: was 10 */
 		ast_log(LOG_ERROR, "Unable to listen for %s!\n", desc->name);
 		goto error;
 	}
--- a/main/manager.c
+++ b/main/manager.c
@@ -9094,6 +9094,14 @@
 static void purge_old_stuff(void *data)
 {
 	struct ast_tcptls_session_args *ser = data;
+	/* VICIfast: this runs on every pass of the AMI accept loop and locks every session in turn, so a busy
+	 * AMI starves accept() and the listen queue overflows. Check at most once a second unless purging. */
+	static struct timeval vf_last;
+	struct timeval vf_now = ast_tvnow();
+	if (ser->poll_timeout != 1 && ast_tvdiff_ms(vf_now, vf_last) < 1000) {
+		return;
+	}
+	vf_last = vf_now;
 	/* purge_sessions will return the number of sessions actually purged,
 	 * up to a maximum of it's arguments, purge one at a time, keeping a
 	 * purge interval of 1ms as long as we purged a session, otherwise