Repeatedly pressing up-arrow key in a Serial over LAN (SOL) session halts the session - IBM eServer BladeCenter HS40

Resolving The Problem

RETAIN tip: H181469

While connected to an HS40 through a Serial Over LAN (SOL) session, pressing the up-arrow key rapidly in the telnet window causes the connection to drop. The HS40 reports a "Not Ready" SOL status.  

The system may be an IBM eServer BladeCenter HS40, type 8839, any model.
 
The BIOS level affected is:  

• version 11

This problem is currently fixed by adjusting system flow control settings. No firmware updates are planned.  

Adjusting the flow control settings for the SOL session improves data handling across network.  

For Red Hat and SUSE ONLY, apply the following:  

1. The command line in /etc/inittab for agetty should have the option -h added. This turns on CTS/RTS flow-control at the application level.
    
   For example:
    
   7:2345:respawn:/sbin/agetty -h ttyS1 19200 vt102
   
   
2. In the grub and/or lilo config.
    
   The console Kernel parameter should also have CTS/RTS turned
   on with the "r" option.
    
   This will force CTS/RTS on the serial/console line.
    
   For example:
    
   kernel ...options...
    
   console=ttyS1,19200n81r"
   
   
3. Just to be safe, setserial should be used at startup to force the default baud rate on ttyS1 from 115200 down to 19200(ONLY SUPPORTED RATE).
    
   In Red Hat the file is:
    
   /etc/rc.d/rc.local
    
   In SUSE the file is:
    
   /etc/init.d/setserial
    
   Examples:
    
   Red Hat:
    
   setserial /dev/ttyS1 baud_base 19200
    
   SUSE (just before the "automatic configuration" section):
    
   run_setserial /dev/ttyS1 baud_base 19200