diff --git a/core/src/main/java/jenkins/agents/WebSocketAgents.java b/core/src/main/java/jenkins/agents/WebSocketAgents.java
index 005587c636..d9560f156e 100644
--- a/core/src/main/java/jenkins/agents/WebSocketAgents.java
+++ b/core/src/main/java/jenkins/agents/WebSocketAgents.java
@@ -36,6 +36,7 @@ import hudson.remoting.Capability;
 import hudson.remoting.ChannelBuilder;
 import hudson.remoting.ChunkHeader;
 import hudson.remoting.Engine;
+import hudson.slaves.SlaveComputer;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.ClosedChannelException;
@@ -107,7 +108,9 @@ public final class WebSocketAgents extends InvisibleAction implements Unprotecte
         Capability remoteCapability = Capability.fromASCII(remoteCapabilityStr);
         LOGGER.fine(() -> "received " + remoteCapability);
         rsp.setHeader(Capability.KEY, new Capability().toASCII());
-        rsp.setHeader(Engine.REMOTING_MINIMUM_VERSION_HEADER, RemotingVersionInfo.getMinimumSupportedVersion().toString());
+        if (!SlaveComputer.ALLOW_UNSUPPORTED_REMOTING_VERSIONS) {
+            rsp.setHeader(Engine.REMOTING_MINIMUM_VERSION_HEADER, RemotingVersionInfo.getMinimumSupportedVersion().toString());
+        }
         rsp.setHeader(Engine.WEBSOCKET_COOKIE_HEADER, cookie);
         return WebSockets.upgrade(new Session(state, agent, remoteCapability));
     }
diff --git a/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly b/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
index 1b04d3c2c9..9e4b36af14 100644
--- a/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
+++ b/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
@@ -40,8 +40,11 @@ THE SOFTWARE.
   <!-- reduce the number of client connection attempts during protocol negotiation -->
   <st:header name="X-Jenkins-Agent-Protocols" value="${app.tcpSlaveAgentListener.agentProtocolNames}"/>
   <!-- publish minimum supported version of remoting agent -->
-  <j:getStatic var="rmvh" className="hudson.remoting.Engine" field="REMOTING_MINIMUM_VERSION_HEADER"/>
-  <st:header name="${rmvh}" value="${app.tcpSlaveAgentListener.remotingMinimumVersion}"/>
+  <j:getStatic var="allowUnsupportedRemotingVersions" className="hudson.slaves.SlaveComputer" field="ALLOW_UNSUPPORTED_REMOTING_VERSIONS"/>
+  <j:if test="${!allowUnsupportedRemotingVersions}">
+    <j:getStatic var="rmvh" className="hudson.remoting.Engine" field="REMOTING_MINIMUM_VERSION_HEADER"/>
+    <st:header name="${rmvh}" value="${app.tcpSlaveAgentListener.remotingMinimumVersion}"/>
+  </j:if>
 
   Jenkins
 </j:jelly>