DB Link Hanging in Oracle 10.2.0.3

Hi,
DB link hanging when we are trying to connect remote system in 10.2.0.3 Linux 64 bit.
Linux 64 bit ----> Remote Linux 64 bit is not working
Linux 64 bit ----> Remote Windows 64 bit is not working
Remote Linux 64 bit ----> Linux 64 bit is not working.
Remote windows 64 bit ----> Linux 64 bit is working
Please help me to solve this.
--S                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

what does V$session_wait says?

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    Adam

    Hi Lars,
      Thanks for the data. I've already read this note and configure all this parameters. But when I'm executing the Create Source System in the BI system the process dies.
      If I look into the logs I see this:
    M  call semaphore clean-up function ...
    M  ***LOG Q0E=> DpSigGenHandler, Exception (c06d007e) [dpnttool.c   432]
      That's the reason why I start guessing about other possible problem.
    Regards

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