Try cmd>
tracert
I have the same problem with Tek-tips sometimes and need to restart the router. The problem is not tek-tips but in fact the nodes on the way to the site that shut it down.
Here's an attempted tracrt run just now.
C:\Users\XXX>tracert
Tracing route to plds.avaya.com [198.152.212.18]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.XXX.XXX.XXX
2 3 ms 5 ms 12 ms 103.19.XXX.XXX
3 3 ms 4 ms 2 ms edge1-syd.d-express.net [103.8.135.33]
4 20 ms 14 ms 3 ms 27.111.243.125
5 4 ms 5 ms 3 ms xe-0-1-1.gw101.sy1.ap.equinix.com [27.111.240.14
4]
6 3 ms 5 ms 3 ms 202.68.67.41
7 4 ms 3 ms 3 ms xe-5-1-0.r05.sydnau01.au.bb.gin.ntt.net [202.68.
64.162]
8 165 ms 165 ms 165 ms as-2.r02.lsanca03.us.bb.gin.ntt.net [129.250.3.1
92]
9 191 ms 165 ms 166 ms xe-2-1-9.r20.lsanca03.us.bb.gin.ntt.net [129.250
.2.141]
10 164 ms 164 ms 164 ms ae-1.r04.lsanca03.us.bb.gin.ntt.net [129.250.5.2
]
11 193 ms 191 ms * los-brdr-01.inet.qwest.net [63.146.27.217]
12 * * * Request timed out.
13 229 ms 230 ms 229 ms 65.113.225.186
14 229 ms 230 ms 229 ms 198.152.166.8
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.