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Editorial Team
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Asked: 2026-05-12T09:06:19+00:00

Hi I have very ugly problem with: java.net.SocketException: No buffer space available (maximum connections

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Hi I have very ugly problem with:
java.net.SocketException: No buffer space available (maximum connections reached?)
It is client-server app. Client is Windows XP SP2 32b, with two net cards core duo. Java 1.6.
u7.
Application have couple server socket open for local communication and couple of client socket for rmi to jboss server.

After couple of hours/days! i am unable to open any new client socket to do communication to server. Server sockets still works.

Windows netstat shows something from 130 to 150 connection. When manually trying I exhausted buffer after ~3500 connections!

I tried:

  • check every socket we use that we also close it.
  • run netstat at background to monitor opened connections
  • run virus scan to found any malware
  • update java to 1.6 u16
  • disable second network interface

    • Once java is restarted I am able to open new connection.

    Whole Exception:

    cause:javax.naming.CommunicationException: Failed to connect to server IP:1099 [Root exception is javax.naming.ServiceUnavailableException: Failed to connect to server IP:1099 [Roo
t exception is java.net.SocketException: No buffer space available (maximum connections reached?): JVM_Bind]]
2009-08-03 09:13:18,968 DEBUG [Thread-9] - stack trace:
2009-08-03 09:13:18,968 DEBUG [Thread-9] - org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1562)
2009-08-03 09:13:18,968 DEBUG [Thread-9] - org.jnp.interfaces.NamingContext.lookup(NamingContext.java:634)
2009-08-03 09:13:18,968 DEBUG [Thread-9] - org.jnp.interfaces.NamingContext.lookup(NamingContext.java:627)
2009-08-03 09:13:18,968 DEBUG [Thread-9] - javax.naming.InitialContext.lookup(Unknown Source)

    –edited
    We finally hit the problem with malfunctioning snmp server. I wrote my notes in comment bellow. Thanks for help.

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    1 Answer

    1. Editorial Team

      What we tried (and successfully) kill the problem.
      JAVA
      – check again every socket we used, register them in some special class if needed
      – provide SocketFactory and ServerSocketFactory for every class which open socket itself (for example jboss Connectors)
      – check opened files, close them in finally
      – URL opens connection too, but if you ask for stream after that, connection is closed together with stream (thanks Stephen).

      OS
      – use different java (1.5, 1.6, 1.7)
      – install new drivers
      – use netstat and monitor traffic on background (using scripts, yes win xp can do the scripts pretty nicely). Use advanced packet sniffers (wire shark?) if needed.
      – win xp have limit for concurrent connections, check them (google) too
      – check again and again for virus and mallware (even on private network!)

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