Unable to connect to yahoo.com, google.com

Strangely, I seem to have lost my ability to connect to www.yahoo.com and www.google.com, and it seems to be a network settings or configuration issue I have with Mac OS X (I do not have this problem in Windows so it rules out the network, also this problem happens on multiple networks, i.e. WiFi hotspots). Can anyone tell me what got changed? It seems like there's an outgoing port block in the OS itself or something...

Below is an example from the command line of my inability to establish a connection to port 80 of www.google.com, as well as my success in connecting to www.apple.com.

sh-3.2# route get www.google.com
route to: iy-in-f147.1e100.net
destination: default
mask: default
gateway: 10.15.27.254
interface: en1
flags: <UP,GATEWAY,DONE,STATIC,PRCLONING>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
0 0 0 0 0 0 1500 0
sh-3.2# telnet www.google.com 80
Trying 209.85.225.147...
telnet: connect to address 209.85.225.147: Connection refused
Trying 209.85.225.103...
telnet: connect to address 209.85.225.103: Connection refused
Trying 209.85.225.106...
telnet: connect to address 209.85.225.106: Connection refused
Trying 209.85.225.99...
telnet: connect to address 209.85.225.99: Connection refused
Trying 209.85.225.105...
telnet: connect to address 209.85.225.105: Connection refused
Trying 209.85.225.104...
telnet: connect to address 209.85.225.104: Connection refused
telnet: Unable to connect to remote host
sh-3.2# traceroute www.google.com
traceroute: Warning: www.google.com has multiple addresses; using 209.85.225.147
traceroute to www.l.google.com (209.85.225.147), 64 hops max, 52 byte packets
traceroute: sendto: No route to host
1 traceroute: wrote www.l.google.com 52 chars, ret=-1
*traceroute: sendto: No route to host
traceroute: wrote www.l.google.com 52 chars, ret=-1
^C
sh-3.2# route get www.apple.com
route to: a96-16-45-15.deploy.akamaitechnologies.com
destination: a96-16-45-15.deploy.akamaitechnologies.com
gateway: 10.15.27.254
interface: en1
flags: <UP,GATEWAY,HOST,DONE,WASCLONED,PROTO3,IFSCOPE>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
0 0 0 0 0 0 1500 349
sh-3.2# telnet www.apple.com 80
Trying 96.16.45.15...
Connected to e3191.c.akamaiedge.net.
Escape character is '^]'.
^]
telnet> close
Connection closed.
sh-3.2#