Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica descargar pdf (Pagina 179)

Chapter 7 Troubleshooting the System 165

currently stopped at a blue screen, break in occurs automatically. If you have any

problems at this point, press CTRL+R to force a resynchronization between the

host and target computers.

With some remote debug configurations, it can be difficult to break into the

debugger. See “Troubleshooting” below for additional tips.

Troubleshooting a Debug Session

Typically, few problems are encountered with local and ICA debugs. Most

problems occur when doing a remote debug and they are generally modem related.

The most common problems encountered are:

Inability to break into the debugger

Failure of the target modem to auto-answer

[Parity Error] message

Each problem is discussed separately below.

Inability to Break into the Debugger

This is the most common problem experienced. The symptom is that the target

computer fails to respond to the CTRL+C and CTRL+R commands from the host

computer. The target and host modems appear to be connected and functioning

normally but the host operator is unable to stop the target computer.

It is not clear why this condition occurs. Because this problem can be difficult to

resolve, Citrix recommends using an ICA debug instead of a remote debug if the

problem occurs. If an ICA debug configuration is not possible, follow the steps

below to resolve this problem:

1. Make sure the target computer is started in debug mode. When the target

computer is rebooted in debug mode, the initial blue startup screen displays

text showing the kernel debugger enabled on a particular COM port. If this text

is not displayed, the debug options were not added correctly to the Boot.ini

file. Make sure the COM port displayed is the one to which the modem is

connected.

2. Change the modem make and model on the target computer. If possible, use

the same make and model modem as the Citrix representative. Similar modems

appear to have a higher remote debug success rate compared with modems

from different manufacturers. Citrix recommends using the U.S. Robotics

Sportster 56Kbps modem.

3. Force the baud rate of both modems to 9600 bps. Consult your modem

documentation for the initialization strings that set the DTE and DCE rates to

9600 bps. For U.S. Robotics modems, this command is AT&N6.

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica Pagina 179