problem with installing R pacakges

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Dear R- Users,

I am unable to install R packages over the internet. Below is my session
information. My guess is that this may be
a proxy issue. I have set the http_proxy_user : my user id(network id) :
password (machine password) .
Maybe not correctly?

Please see what the R for Windows FAQs say about using proxies. If that 
does not help, ask your local sysadmin. We cannot help.

Uwe Ligges
The error I get is as below

install.packages("MASS")
Warning: unable to access index for repository
http://ftp.iitm.ac.in/cran/bin/windows/contrib/2.15
Warning: unable to access index for repository
http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.15
Warning message:
package ?MASS? is not available (for R version 2.15.1)

Below is my session info. I searched in the archives but was not able to
find the issue. Please excuse me if this
is a repost.

sessionInfo()
R version 2.15.1 (2012-06-22)
Platform: x86_64-pc-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_India.1252  LC_CTYPE=English_India.1252
LC_MONETARY=English_India.1252 LC_NUMERIC=C
LC_TIME=English_India.1252
attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base
loaded via a namespace (and not attached):
[1] tools_2.15.1

Thanks in advance.

Regards,
Kishor

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