Why am I unable to connect to Workstation or see the agent disconnecting?

Document ID:  TEC1831886
Last Modified Date:  06/13/2017
{{active ? 'Hide' : 'Show'}} Technical Document Details


  • CA Application Performance Management


  • CA Application Performance Management:Release:9.7
  • CA Application Performance Management:Release:10.0
  • CA Application Performance Management:Release:10.2
  • CA Application Performance Management:Release:10.3
  • CA Application Performance Management:Release:10.5
  • CA Application Performance Management:Release:10.5.1



 Unable to connect to Workstation or Agent disconnecting and the MOM log is showing below error:


[ERROR] [Acceptor Helper 2] [Manager.Transport] Incoming connection failed because of exception
java.lang.RuntimeException: Transporting data too big consumed 4001 buffers exceeded max allowed: 4000
at com.wily.isengard.postofficehub.link.v1.server.BufferPool.take(BufferPool.java:100)
at com.wily.isengard.postofficehub.link.v1.server.ByteBufferInputStream.readFromChannel2(ByteBufferInputStream.java:224)
at com.wily.isengard.postofficehub.link.v1.server.ByteBufferInputStream.readFromChannel(ByteBufferInputStream.java:188)
at com.wily.isengard.postofficehub.link.v1.server.ByteBufferInputStream.read(ByteBufferInputStream.java:138)
at java.io.DataInputStream.readUnsignedShort(DataInputStream.java:337)
at java.io.DataInputStream.readUTF(DataInputStream.java:589)
at java.io.DataInputStream.readUTF(DataInputStream.java:564)
at com.wily.isengard.postofficehub.link.v1.server.ABaseServerTransport.accept(ABaseServerTransport.java:114)
at com.wily.isengard.postofficehub.link.server.AcceptorHelper.run(AcceptorHelper.java:88)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)

APM 9.7, 10.0, 10.2, 10.3, 10.5, 10.5.x

 -For EM as a server, this error could occur because a client is sending huge amounts of data. The client could be an agent or workstation sending data to the EM.

 -Prior to 9.7.x, in this situation an EM could crash with an Out Of Memory exception. In 9.7.x and later, a clamp was added to prevent the crash. Once the clamp is hit, the EM will disconnect the client, and the client could try to re-connect automatically.

 -The impact of increasing this clamp is that the EM needs to have enough memory/heap.

 -To calculate approximately how much memory the value set will require, please use the following formula(128K * VALUE), EG:

            128K * 8000 = 1GB this is extra for the input buffers of transportation layer


 Open the "IntroscopeEnterpriseManager.properties" in the MOM EM's <EM_HOME>\config folder and add the following property:


 A restart of the EM is needed for this new setting to take effect.

Please help us improve!

Will this information enable you to resolve your issue?

Please tell us what we can do better.

{{feedbackText.length ? feedbackText.length : '0'}}/255


Not what you were looking for?

Search Again >

Product Information

Support by Product >


Join a Community >