Change to the Service File is lost after system restart!!

Question:
Hi Guru,
We're now trying to setup the SAP router under the windows 2003.
The problem we have now is..we need to add the SAP Ports into the services file, but everytime the server is restarted, all the changes are lost
Could anybody plz advise what should we do to solve/prevent the problem..
Thanks,
xin
Answer:
First check that the user has authorisations to make changes to the file and folders so your not opening it as read only, and then make your changes confirm they are saved, then temp make the file read only before you reboot
Answer:
Hi Barryf,
The solution is work!!
Many thanks for your help,
xin

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