[Rd] install.packages problem

[Rui Barradas]

Hello,

R 3.4.1 on Windows 7, sessionInfo at the end.
Is there a problem with install.packages? Since last friday every time I 
try to install a package in RGui, I start by choosing the CRAN mirror 
Cloud-0 and RGui hangs. So I restart RGui and choose Portugal (Lisbon) 
and get the following warning after a long while (minutes).

install.packages("igraph")
--- Please select a CRAN mirror for use in this session ---
Warning: unable to access index for repository 
http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
   cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
Warning: unable to access index for repository 
http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4:
   cannot open URL 
'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES'

   There is a binary version available but the source version is later:
        binary source needs_compilation
igraph  1.0.1  1.1.1              TRUE

Do you want to install from sources the package which needs compilation?
y/n: y
installing the source package ‘igraph’

trying URL 'http://cran.radicaldevelop.com/src/contrib/igraph_1.1.1.tar.gz'
Content type 'application/x-gzip' length 3376077 bytes (3.2 MB)
downloaded 3.2 MB
[...]

The rest of the process goes on with success.
The problem seems to be with http://www.stats.ox.ac.uk/pub/RWin/src/contrib

When I check
 > options("repos")
$repos
                                 CRAN                            CRANextra
     "http://cran.radicaldevelop.com" "http://www.stats.ox.ac.uk/pub/RWin"

I'm lead to think that install.packages should try 
"http://cran.radicaldevelop.com" first, only in case of failure CRANextra.

What is going on?

 > sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default

locale:
[1] LC_COLLATE=Portuguese_Portugal.1252 
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C 

[5] LC_TIME=Portuguese_Portugal.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] igraph_1.0.1

loaded via a namespace (and not attached):
[1] compiler_3.4.1 magrittr_1.5   tools_3.4.1

Thanks in advance,

Rui Barradas