What are the permission we need to assign to write log file in hosted web application ?

i have hosted my application in public domain. I would like to write a log whenever transactions happens but  i could not write anything in that. Whenever i test local it is working fine.
I got some error message like permission denied. How to set the log file in hosted web application. Where and how to set the permission ?
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you need to give your IUSR_servername write permission for the directory that you are trying to write the log file to.

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VarshiniAuthor Commented:
The site is hosted in the public domain .... ????
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