Looks like the proxy
# traceroute slashdot.org
traceroute to slashdot.org (66.35.250.150), 30 hops max, 38 byte packets
1 pppgw (165.146.0.1) 34.756 ms 16.419 ms 15.708 ms
2 rndf-ip-er-2-fe-12-0-0-611.telkom-ipnet.co.za (196.43.10.5) 71.109 ms 16.908 ms 15.547 ms
3 ash-ip-dir-equinix-pos-6-1.telkom-ipnet.co.za (196.43.9.146) 341.284 ms 339.772 ms 341.676 ms
4 12.117.208.5 (12.117.208.5) 341.908 ms 341.043 ms 340.402 ms
5 12.122.81.250 (12.122.81.250) 344.989 ms 345.609 ms 345.099 ms
6 ggr2-p390.wswdc.ip.att.net (12.123.9.85) 342.532 ms 340.876 ms 341.987 ms
7 dcr2-so-3-0-0.washington.savvis.net (192.205.32.46) 342.405 ms 341.462 ms 340.996 ms
8 bcs1-as0-0.Washington.savvis.net (204.70.192.178) 341.673 ms 342.749 ms 340.410 ms
9 dcr1-so-3-0-0.Atlanta.savvis.net (204.70.192.53) 358.759 ms 359.313 ms 359.174 ms
10 dcr1-so-3-2-0.dallas.savvis.net (204.70.192.82) 391.097 ms 388.123 ms 378.133 ms
11 dcr2-so-2-0-0.LosAngeles.savvis.net (204.70.192.86) 412.620 ms 411.801 ms 412.613 ms
12 dcr1-as0-0.LosAngeles.savvis.net (204.70.192.117) 411.381 ms 412.781 ms 411.196 ms
13 dcr2-so-2-0-0.SanFranciscosfo.savvis.net (204.70.192.90) 417.169 ms 417.133 ms 416.076 ms
14 bhr1-pos-0-0.SantaClarasc8.savvis.net (208.172.156.198) 419.230 ms 418.867 ms 419.478 ms
15 csr1-ve243.santaclarasc8.savvis.net (66.35.194.50) 419.318 ms 420.509 ms 419.520 ms
16 66.35.212.174 (66.35.212.174) 422.469 ms 421.466 ms 421.197 ms
17 slashdot.org (66.35.250.150) 421.470 ms !<10> 420.959 ms !<10> 420.016 ms !<10>
# tcping slashdot.org 80
slashdot.org port 80 open.
# http@ slashdot.org
<HTML>
<HEAD><TITLE>500 Server Error</TITLE></HEAD>
<BODY>
<H1>Server Error</H1>
<H4>
The following error occurred:<P>
Code:
Could not connect because of networking problems. Contact your system administrator.
</H4>
<HR>
Please contact the administrator.
</BODY>
</HTML>
So slashdot.org is reachable, just not with a browser