title: Perl cpan: error installing DateTime, CHECKSUM download failure
body: <p>I am running Perl 5.10 on a shared Red Hat Linux 6.2 server.  I have asked the root user of the machine to install the Perl DateTime module for me, using the following commands:</p>
  
  <p>perl -MCPAN -e shell 
  cpan> install DateTime</p>
  
  <p>We were able to successfully install other Perl modules such as Text::CSV before. </p>
  
  <p>But the following error occurred while installing DateTime.  Here is the last bits of error log:</p>
  
  <p><strong>Question:</strong> It looks like the error might be complaining about not being able to  fetch the CHECKSUM file from  <a href="ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS" rel="nofollow">ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS</a>.  However, I have no problem browsing to this exact file from my Internet Explorer.  Can someone suggest ways to workaround this?  Thanks.</p>
  
  <pre><code>Trying with "/usr/bin/wget -O /root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp12173" to get
      "ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS.gz"
      --2013-06-20 09:30:06--  ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS.gz
             =&gt; b/root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp12173b
  Resolving ftp.perl.org... 203.178.137.175, 163.143.1.21 Connecting to ftp.perl.org|203.178.137.175|:21... connected.
  Logging in as anonymous ... Logged in!
  ==&gt; SYST ... done.    ==&gt; PWD ... done.
  ==&gt; TYPE I ... done.  ==&gt; CWD (1) /pub/CPAN/authors/id/R/RJ/RJBS ... done.
  ==&gt; SIZE CHECKSUMS.gz ... done.
  ==&gt; PASV ... done.    ==&gt; RETR CHECKSUMS.gz ... 
  No such file bCHECKSUMS.gzb.
  
  Warning: no success downloading '/root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp12173'. Giving up on it. at /usr/share/perl5/CPAN/Distribution.pm line
  1311
  
  As a last resort we now switch to the external ftp command '/usr/kerberos/bin/ftp'
  to get '/root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp12173'.
  
  Doing so often leads to problems that are hard to diagnose.
  
  If you're the victim of such problems, please consider unsetting the ftp config variable with
  
      o conf ftp ""
      o conf commit
  
  Issuing "/usr/kerberos/bin/ftp -n"
  
    Trying with external ftp to get
      ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS
    Going to send the dialog
      open ftp.perl.org
      user anonymous Red Hat, Inc.@localhost.localdomain
      lcd /root/.cpan/sources/authors/id/R/RJ/RJBS
      cd /
      cd pub
      cd CPAN
      cd authors
      cd id
      cd R
      cd RJ
      cd RJBS
      bin
      get CHECKSUMS CHECKSUMS.tmp12173
      quit
  
  Not connected.
  Local directory now /root/.cpan/sources/authors/id/R/RJ/RJBS
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Not connected.
  Bad luck... Still failed!
  Can't access URL ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS.
  
  Your urllist is empty! The urllist can be edited. E.g. with 'o conf urllist push ftp://myurl/'
  
  Could not fetch authors/id/R/RJ/RJBS/CHECKSUMS
  </code></pre>
  
  <p><strong>UPDATE1:</strong></p>
  
  <p>We also tried the o conf ftp "" and o conf commit commands, but we still had an error.</p>
  
  <pre><code>Trying with "/usr/bin/wget -O /root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp16529" to get
      "http://www.perl.org/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS.gz"
      --2013-06-20 13:52:07--  http://www.perl.org/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS.gz
  Resolving www.perl.org... 207.171.7.41, 207.171.7.51 Connecting to www.perl.org|207.171.7.41|:80... failed: Connection refused.
  Connecting to www.perl.org|207.171.7.51|:80... failed: Connection refused.
  Warning: no success downloading '/root/.cpan/sources/authors/id/R/RJ/RJBS/CHECKSUMS.tmp16529'. Giving up on it. at /usr/share/perl5/CPAN/Distribution.pm line
  1311
  Fetching with LWP:
    ftp://ftp.perl.org/pub/CPAN/authors/id/R/RJ/RJBS/CHECKSUMS
  Checksum for /root/.cpan/sources/authors/id/R/RJ/RJBS/Test-Fatal-0.010.tar.gz ok Test-Fatal-0.010 Test-Fatal-0.010/README Test-Fatal-0.010/Changes Test-Fatal-0.010/LICENSE Test-Fatal-0.010/dist.ini Test-Fatal-0.010/META.yml Test-Fatal-0.010/MANIFEST Test-Fatal-0.010/t Test-Fatal-0.010/t/basic.t Test-Fatal-0.010/META.json Test-Fatal-0.010/Makefile.PL Test-Fatal-0.010/lib/Test Test-Fatal-0.010/lib/Test/Fatal.pm
  Test-Fatal-0.010/t/like-exception.t
  Test-Fatal-0.010/t/release-pod-syntax.t
  
    CPAN.pm: Going to build R/RJ/RJBS/Test-Fatal-0.010.tar.gz
  
  Checking if your kit is complete...
  Looks good
  Warning: prerequisite Try::Tiny 0.07 not found.
  Writing Makefile for Test::Fatal
  Could not read '/root/.cpan/build/Test-Fatal-0.010-GNYnPy/META.yml'. Falling back to other methods to determine prerequisites
  ---- Unsatisfied dependencies detected during ----
  ----       RJBS/Test-Fatal-0.010.tar.gz       ----
      Try::Tiny [requires]
  Shall I follow them and prepend them to the queue of modules we are processing right now? [yes] Running make test
    Delayed until after prerequisites
  Running make install
    Delayed until after prerequisites
  Running install for module 'Try::Tiny'
  'YAML' not installed, falling back to Data::Dumper and Storable to read prefs '/root/.cpan/prefs'
  Running make for D/DO/DOY/Try-Tiny-0.12.tar.gz Fetching with LWP:
    http://www.perl.org/CPAN/authors/id/D/DO/DOY/Try-Tiny-0.12.tar.gz
  LWP failed with code[500] message[Can't connect to www.perl.org:80 (connect: Connection refused)] Fetching with LWP:
    ftp://ftp.perl.org/pub/CPAN/authors/id/D/DO/DOY/Try-Tiny-0.12.tar.gz
  LWP failed with code[500] message[]
  Fetching with Net::FTP:
    ftp://ftp.perl.org/pub/CPAN/authors/id/D/DO/DOY/Try-Tiny-0.12.tar.gz
  Catching error: "Timeout at /usr/share/perl5/Net/FTP.pm line 491\cJ" at /usr/share/perl5/CPAN.pm line 391
          CPAN::shell() called at -e line 1
  </code></pre>