Strange problems accessing Netflix images

[david-8uUts6sDVDvs2Lz0fTdYFQ at public.gmane.org (David Kramer)]

The Netflix website comes up fine, except none of the images come up. 
This is true ONLY for netflix, and true for every computer in my house. 
  And this just happened a few days ago (I've been a member for years).

Note that the images come from cdn-*.nflximg.com (208.111.128.6 and 
208.111.128.7), not netflix.com.

If I try to wget an image, it hangs.  Looking at Wireshark as I do so 
shows a bunch of outgoing packets, but nothing coming back.

If I traceroute it, I get two hops, then stars for the next 26 lines
  1  * * *
  2  68.85.185.53 (68.85.185.53)  10.819 ms  14.050 ms  15.021 ms
  3  te-5-1-ar02.needham.ma.boston.comcast.net (68.87.145.161)  15.965 
ms  16.843 ms *
  4  * * *
...
29  * * *
30  * * *

I checked my cablemodem (SMC-8014), and it doesn't show any website 
blocking, etc.  When I use the web-based interface to my cablemodem to 
traceroute it, I get
Tracing route to 208.111.128.6 over a maximum of 30 hops
  1:   15 ms,  <10 ms,  <10 ms, 0.0.0.0
  2:  <10 ms,  <10 ms,  <10 ms, 68.85.185.49
  3:  <10 ms,  <10 ms,  <10 ms, 68.87.145.161
  4:   15 ms,  <10 ms,   15 ms, 68.85.162.70
  5:   15 ms,   20 ms,   15 ms, 68.86.90.61
  6:   15 ms,   15 ms,   15 ms, 64.210.15.57
  7:   15 ms,   20 ms,   30 ms, 64.208.222.150
  8:   15 ms,   15 ms,   25 ms, 69.28.171.201
  9:   15 ms,   15 ms,   40 ms, 208.111.128.6
10:    *        *        *     Request timed out.
11:    *        *        *     Request timed out.
12:    *        *        *     Request timed out.

Tracing route to 208.111.128.7 over a maximum of 30 hops
  1:   15 ms,  <10 ms,  <10 ms, 0.0.0.0
  2:  <10 ms,  <10 ms,  <10 ms, 68.85.185.49
  3:  <10 ms,  <10 ms,  <10 ms, 68.87.145.161
  4:  <10 ms,   15 ms,  <10 ms, 68.85.162.70
  5:   15 ms,   25 ms,   15 ms, 68.86.90.61
  6:   15 ms,   15 ms,   15 ms, 64.215.24.85
  7:   20 ms,   30 ms,   25 ms, 64.208.222.150
  8:   15 ms,   35 ms,  <10 ms, 208.111.128.7
  9:    *        *        *     Request timed out.
10:    *        *        *     Request timed out.
11:    *        *        *     Request timed out.


It sure looks to me like my cablemodem can reach it, but my server 
can't, and I don't know why that would be, since my firewall doesn't 
report anything.

Any thoughts?  Thanks.