Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Scaricare il pdf (Pagina 177)

Troubleshooting TopSpin 177

DONE

INDEX

1. Open a Linux shell and become superuser; type su -

2. Check if there are firewall rules that prohibit to contact the spectrometer

a) go to the directory /etc/sysconfig

• cd /etc/sysconfig

b) what is the configuration of iptables

• iptables -L

Did you get a information that contains three times

(policy ACCEPT)?

• Yes ? No problem, go to step 3

• No, the answer is at great length? go to step c

c) to check if this is the problem it is the best to stop the firewall temporarily.

Note that this can cause security problems. If in doubt please contact your

system administrator. To stop the firewall type in (for more details about the

firewall see chapter 15.2):

• service iptables stop

Check the spectrometer connection once again. Does it work now?

• No ? No problem, go to step 3

• Yes ? You might have found the problem. The system administrator

has to make sure that the ethernet card for spectometer control gets full

access or he has to disable firewall package in general. This can be

done by the command:

chkconfig iptables off

Note: You have to reboot the PC.

3. Reboot the PC and CCU using reviveccu

type reviveccu

→ follow the instructions:

a) You will be asked to switch off the acquisition rack

b) reviveccu will automatically reboot the PC

1. If you use the firewall package iptables, you have to make sure that it allows the ethernet card

for spectrometer control full access (see chapter 15.2.1)

2. The command reviveccu executes a shell script which will first remove the two files:

/usr/diskless/clients/spect/root/etc/mtab and .../utmp and then

reboot spectrometer-CCU and Linux-PC.

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Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Pagina 177