portsnap fetch failed on FreeBSD 8.2

[Xu Zhe]

Hello,

I am a newbie to FreeBSD world. :)

I got a task to port Java to a private-built FreeBSD system which is
branched from FreeBSD 8.2. As a start of this, I tried to learn port
stuffs, and did 'portsnap fetch' but failed. After that, I tried to
change portsnap server, and I even tried a generic FreeBSD 8.2 version,
which failed too with merely the same error. Here is what I got in most
of the cases (not totally the same for each time, but I suppose they are
familiar):

==========================

# portsnap fetch
Looking up us.portsnap.FreeBSD.org mirrors... 6 mirrors found.
Fetching public key from your-org.portsnap.freebsd.org... done.
Fetching snapshot tag from your-org.portsnap.freebsd.org... done.
Fetching snapshot metadata... ahdone.
Fetching snapshot generated at Tue May 28 08:03:52 CST 2013:
7719e39e7b7751c91689858400a3a514488a0d852d194b100% of 8943 kB 63 kBps 00m00s
Extracting snapshot...
snap/99cac1a150337b4349092e169edc231ca5025106d00d801c4b09e49c748bd8a5.gz: (Empty
error message)
tar: Error exit delayed from previous errors.

==========================

I suppose the downloaded tarball
(/var/db/portsnap/7719e39e7b7751c91689858400a3a514488a0d852d194b.tgz) is
broken since I cannot unpack it manually too, and I saw the file on the
server becomes bigger (seems 60MB+) when I tried it hours later.

Server data corrupted? Or anyone knows what might be the problem here?

Thanks.
Peter