Manage the Number of Simultaneous Sessions for XCOM for Windows and TCPIP

Products

• XCOM Data Transport
• XCOM Data Transport - Windows

Issue/Introduction

TCPIP does not allow you to specify a maximum number of transfers. How can I limit the number of simultaneous transfers being sent?

Environment

XCOM™ Data Transport® for Windows

Resolution

OUTGOING TRANSFERS

The xcom.ses file controls outgoing transfers. If you do not configure your xcom.ses file, the maximum number of transfers that may be sent to any one partner is restricted to one.

Here is a sample xcom.ses file. It is found in the c:\xcomnt\config directory (or wherever you have installed XCOM).

# connection_profile  =  number_of_sessions_allowed     (this is a comment  indicating the format of what follows)
 XCOMMVS=20 
 host.ca.com=6 
 123.123.12.12=2 
 fe:fe:fe:fe:fe:fe:fe:fe=15 

• Specify the connection_profile name in the xcom.ses file the same way that it is specified in your remote_system transfer parameter.
  
  
• The connection_profile name is case sensitive.
  
  
• If you sometimes use the hostname and sometimes the IP address, specify a connection_profile for each.
  
  
• IPV6 is supported for the connection_profile parameter.
  
  
• SNA partners may be specified in this file.

For more information, please see Customize the XCOM.SES File (Scroll down to this section)

INCOMING TRANSFERS

The maximum number of incoming TCP/IP transfers is specified by the c:\xcomnt\config\xcom.glb parameter MAX_REMOTE_TCP. The default value is 32. After this value is reached, all incoming transfers above this limit are blocked and the message:

XCOMN0512E Maximum remote tcp sessions reached

is sent back to the partner that initiated the transfer. As XCOM is currently installed, the MAX_REMOTE_TCP parameter is not specified in xcom.glb and defaults to 32. Therefore, to change the value of this parameter you will need to add it to c:\xcomnt\config\xcom.glb with a new value and stop and start the xcomd service.

However, it is preferable for the partner to set limits on sending to the Windows box, rather than rely on the MAX_REMOTE_TCP parameter. If the partner sets limits, according to the procedure for that platform, XCOM can control the sending limit so all transfers can reach the Windows box successfully, rather than being blocked.