2018-09-12

TNS-12542

The problem is due to the fact that the free TCP ports on the Windows client have been exhausted and it is trying to make use of a port which is in TIME_WAIT state and which throws the error:
TNS-12542: Address already in use
(Doc ID 276812.1)
There are 3 possible solutions:

1.) Increase the free port range:
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Start Registry Editor (Regedt32.exe).

Locate the following key in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

On the Edit menu, click Add Value, and then add the following registry value:

Value Name: MaxUserPort Data Type: REG_DWORD Value: 65534 

Valid Range: 5000-65534 (decimal) Default: 0x1388 (5000 decimal)

Description: This parameter controls the maximum port number used when an application requests any
available user port from the system. Normally, ephemeral (that is, short-lived) ports are allocated between the values of 1024 and 5000 inclusive.


2.) Decrease the value for TIME_WAIT state:
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TcpTimedWaitDelay (new in Windows NT versions 3.51 SP5 and later)
Key: Tcpip\Parameters
Value Type: REG_DWORD - Time in seconds
Valid Range: 30-300 (decimal)
Default: 0xF0 (240 decimal)

Description: This parameter determines the length of time that a connection will stay in the TIME_WAIT state when being closed. While a connection is in the TIME_WAIT state, the socket pair
cannot be re- used. This is also known as the "2MSL" state, as by RFC the value should be twice
the maximum segment lifetime on the network. See RFC793 for further details.

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