SAP installation guiengine:No GUI server connected;waiting for connection

Hi All,
I need one help
I am trying to install SAP ECC 6 in Redhat Linux 5 and database oracle
I have installed java 1.4.2_16, I have set the environmental variables also.
But if I start the SAP installation by executing SAPINST , I am facing the below error
guiengine: No GUI server connected; waiting for a connection on host welcome, port 21200 to continue with the installation
I have tried to execute xclock to check it, but its gives the below error
ERROR: canu2019t open display: welcome:0.0
I found that before setting the below display environmental variable,  xclock worked good, but after setting the below display environmental variable, I am facing this error
export DISPLAY=hostname:0.0
I searched for this error, some people posted that we have to change the display environmental variable like export DISPLAY=:0, set DISPLAY=:0.0,
I tried it but still facing the same No GUI server connected error.
I hope it will be a problem with display environmental variable and I have no other clues, please help me, Thanks.
Thanks,
Senthil.

Hi,
We are trying in my personal laptop, so I have not set any ip addess. Is there any other way like our loop back adapter settings in windows, to configure ip address in Redhat linux 5 in individual machines.
Also I searched in forums few other people who has already faced the same error. They have set the display environment variable export DISPLAY=ipaddress:0.0 with  ip address but they also has faced the same error and itu2019s not resolved.
Please help me if there will be any other reason for this error, Thanks.
Thanks,
Senthil.

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