diff --git a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
index 2416f233f..800643c75 100644
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
@@ -349,7 +349,7 @@ class LanTcpPlugin extends TcpPlugin {
 				tryToClose(ss, LOG, WARNING);
 			}
 		}
-		if (ss == null) {
+		if (ss == null || !ss.isBound()) {
 			LOG.info("Could not bind server socket for key agreement");
 			return null;
 		}
diff --git a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java
index e97ff2993..2130c69cc 100644
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java
@@ -162,7 +162,7 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 				tryToClose(ss, LOG, WARNING);
 			}
 		}
-		if (ss == null) {
+		if (ss == null || !ss.isBound()) {
 			LOG.info("Could not bind server socket");
 			return;
 		}