diff --git a/agent/agentssh/x11_test.go b/agent/agentssh/x11_test.go
index c8e3dd45c1db5..4946fa2ac03c7 100644
--- a/agent/agentssh/x11_test.go
+++ b/agent/agentssh/x11_test.go
@@ -162,10 +162,17 @@ func TestServer_X11_EvictionLRU(t *testing.T) {
c := sshClient(t, ln.Addr().String())
+ // block off one port to test x11Forwarder evicts at highest port, not number of listeners.
+ externalListener, err := inproc.Listen("tcp",
+ fmt.Sprintf("localhost:%d", agentssh.X11StartPort+agentssh.X11DefaultDisplayOffset+1))
+ require.NoError(t, err)
+ defer externalListener.Close()
+
// Calculate how many simultaneous X11 sessions we can create given the
// configured port range.
+
startPort := agentssh.X11StartPort + agentssh.X11DefaultDisplayOffset
- maxSessions := agentssh.X11MaxPort - startPort + 1
+ maxSessions := agentssh.X11MaxPort - startPort + 1 - 1 // -1 for the blocked port
require.Greater(t, maxSessions, 0, "expected a positive maxSessions value")
// shellSession holds references to the session and its standard streams so
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