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Comcast blocking legit sites now!?!?

by steve8411 / July 9, 2006 12:23 PM PDT

For over a week, I have been unable to reach a cell phone forum, , and thought the site was down.

Went to my office .. accessed site without a problem. Chatted with the site owner, he said site has had no outtage whatsoever...

Called comcast... their ''level 2'' tech said, ''it's your PC, not Comcast'' So, all three pc's I use won't reach the same site using Comcast, but all the pc's at my office will. Hmmm... Im not a rocket scientist, BUT. Asked the tech to tracert, "sorry, I cannot do that from here" was his reply. Nice one Comcast!

Went into Comcast's support forum and posted. GUESS WHAT?

Of all the responses, no other Comcast user could access the site either!!!

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Not blocked.
by R. Proffitt Forum moderator / July 9, 2006 12:47 PM PDT
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Yes, it is blocked.
by steve8411 / July 9, 2006 9:55 PM PDT
In reply to: Not blocked.

Thanks for attempting to point out the obvious.

I have tried to resolve based on IP rather than by domain name. And, NO, it will not resolve while using Comcast as the ISP.

So, it is doubtfully a Domain Name Server issue.

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I have comcast and ...
by R. Proffitt Forum moderator / July 10, 2006 12:48 AM PDT
In reply to: Yes, it is blocked.

It didn't work by name. It did however by IP.

So the usual user will call it blocked. It's not really blocked but the nameserver is not listing it.

You seem upset with me about this. Take it out on someone else.


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I have Comcast and see it fine
by ChazzMatt / July 12, 2006 8:14 PM PDT
In reply to: I have comcast and ...

I live in metro Atlanta area and I see that web address fine. I copied and pasted the www address srraight from your post into my web browswer. Shows just fine.

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Try OpenDNS
by fnash / July 12, 2006 8:45 PM PDT

It really sounds like DNS issues to me. To test this, go to and use the instructions there if needed to try the OpenDNS servers instead. That will tell you for certain if it's the Comcast DNS servers.

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Thanks, fnash!
by yappie71 / July 13, 2006 4:46 AM PDT
In reply to: Try OpenDNS

I did not know about OpenDNS. Thanks!


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Comcast here too...
by netmasta / August 4, 2006 5:56 AM PDT

I have Comcast too, south of Boston and I can reach that site just fine.

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wow, mr. moderator..........
by harriet40 / August 4, 2006 5:25 AM PDT
In reply to: I have comcast and ...

i don't think he's taking it out on you; you seem to be perturbed by his postings instead. ease up--not all of us are adept at handling these issues. comcast IS a pain for us who are less experienced. my ie7 keeps crashing (for example). i hope you're not so harsh with everyone else. hope your day gets better, man..........

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Mine worked too ..
by wildhair / July 12, 2006 9:44 PM PDT

I have comcast in Ft. lauderdale, FL. I pasted to my IE and it worked fine.

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Wildhair in Ft Laud
by dromel / August 9, 2006 3:53 PM PDT
In reply to: Mine worked too ..

Just a bit off topic question. Since we both have the same locale and profession, I was curious as to your opinion of Comcast cable internet service. I have been with Bell South DSL for 5 or 6 years, but am considering a switch to Comcast because of speed and price considerations.


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No problems Comcast in Gadsden AL
by alexcomp / July 12, 2006 10:29 PM PDT

Just got there....

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It isn't just a Comcast Problem
by mail1 / July 12, 2006 10:41 PM PDT

This is a problem everywhere with every ISP. Until relatively recently, Comcast, like other ISPs, operated their Internet service like Frame Relay. There was no security at all. Now, Comcast has since turned 180 degrees and is actively securing their leg of the Internet. But, sometimes, they go too far. In Comcast's defense (I am only a customer), I experience the same problems with other ISPs and even at my office -- system administrators blocking web sites and sometimes entire IP blocks. If you talk to a system administrator about this, you will find out that this is very muddy water and I feel sorry for the administrators because they receive so much flak.

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by jaylyons / July 12, 2006 11:31 PM PDT

I'm on Comcast and get to that site just fine....

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comcast blocking?
by grennie / July 13, 2006 12:08 AM PDT

it could be your computer. Try deleteing Your HOSTS file.

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Boston area Comcast has a DNS lookup issue.
by R. Proffitt Forum moderator / July 13, 2006 12:35 AM PDT

But I used Sam Spade and found the IP to the site. The site itself is not blocked.

Collapse - - invalid DNS also
by zenfire / July 13, 2006 1:12 AM PDT

for a year, I used to be able to access, and then one weekend it just stopped resolving - Cannot Find Server. I tried calling support, no help - must be user error - noobs.

I switched to verizon fios and can access the website again. does do some strange DNS routing and web-farming, but should Comcast be implementing a DNS strategy that "usually" resolves to IPs?

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Comcast blocking legit sites now!?!?
by dls744447 / July 13, 2006 1:31 AM PDT

Hi, I copy-pasted your link into my browser on my home PC and was able to bring up the forum page without a problem. I have Comcast & live in Smyrna, TN. I've had my issues with Comcast in the past. Sounds as if you have too. But I think there's a 99.89% chance it's not them causing your problem this time. Which then makes it harder to pin point the problem you are having. I would have "assumed" the same thing. Then again I "always" get in hot water for assuming. Hope you find your answer soon. Does seem strange. Could be one of your spam programs like Spyware Doctor (which is a great program) blocking it or your PC's security settings are too high. Best of luck


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It may not be blocking; it may be DNS issues
by yappie71 / July 13, 2006 3:01 AM PDT

My broadband provider is Adelphia, which provides an excellent 5 meg broadband service. It's never down and works great. BUT, occasionally I can't reach favorite sites.
One time, when I couldn't reach, I called support. The support office is in Pennsylvannia, and I asked the support person if she could reach She could. So she looked up which DNS server she was using, and, indeed, it was different from mine. I already knew that my local DNS server in Ven Nuys, Calif., is cranky--this had happened before--and, indeed, any Adelphia customer in the Western half of the United States could not reach that day. She was kind enough to give me the IP address of an Adelphia DNS server in Virginia, one that appears to be less cranky. So, I use that on those rare times when I can't reach an important site.
The DNS issue that's happening appears to be some problem with getting updates from certain other DNS servers. The Adelphia server was reporting failures in getting DNS information from's hosting company, BellSouth. After a bunch of phone calls and emails, I'm still not sure who had the problem, Adelphia or BellSouth (and it's almost impossible to assign blame confidently in these IP incidents). It may be a software issue between the two servers. Who knows.
The lession here is, before you start to think about Big Brother, check out DNS issues.


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This might help understand your issue
by Mary Norwood / July 13, 2006 6:17 AM PDT
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by Fareid / July 13, 2006 2:44 PM PDT

I have emailed a message and was sent back by postmaster general "UNDELIVERED"


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(NT) (NT) Worked instantly in suburban Detroit (n/t)
by DirkBelig / July 13, 2006 4:29 PM PDT
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by netmasta / August 4, 2006 5:58 AM PDT

Damn it. Sorry I didn't see the date on the post. The forums sometimes default to page 2 instead of the first page.

Again, sorry.

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I had the same problem briefly
by VOLBUNNY / January 18, 2010 9:00 PM PST

We have had Comcast internet service for years and for some reason about midday yesterday a site I use daily just quit working out of the blue. I called this vendor to order something since I couldn't access the site and mentioned something about the site being down and they said it was working fine on their end. So they gave me to support and to make a long story short after some time they said that Comcast was blocking their site and that I would have to talk to Comcast. It being a holiday yesterday I had to sit on hold for someone at Comcast but when I did get a person he said that it was the firewall and to turn it off. I protested at first but he explained that I would keep the firewall on on the computers and our other router but he would just turn the firewall off on their modem/router. He did this remotely and I was able to access the site in question. That simple! I guess I could turn the firewall on that device back on and go allow access to that site if I felt inclined to but don't really feel the need to in our situation.

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Same here as well...
by ddarty / February 4, 2010 5:28 AM PST

This happens to me as well. Seemingly at random... Just today I was unable to view a client's website on my work PC (or any pc in-house for that matter). I then pulled it up with my smartphone. I unplugged the Comcast modem for 10 seconds and plugged it back in. BINGO! Back in business.

Comcast isn't doing this intentionally, folks. Comcast leases out horrible hardware at premium prices and we just smile and ask for more. Who is really at fault here?

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How do you people . . .
by Coryphaeus / February 4, 2010 9:52 PM PST

find these four year old posts? I seriously doubt the original problem still exists.

Just commenting.

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Comcast blocking legit sites now!?!?
by JimChicca / February 18, 2011 12:34 AM PST


Comcast is blocking my site which I use for my classes in chemistry. The reason may be that it has the extension ".net" which might look like a competitor. The site is available by any other route except Comcast.

Comcast, of course, denies this, so I can't get it fixed. This is a real problem for my student, much less for me, since I can't unload through Comcast.

I will recommend to all my student to get some other service than Comcast. I recommend to all out there to do the same.

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If you want to discuss this.
by R. Proffitt Forum moderator / February 18, 2011 12:43 AM PST

While I find this to often be a DNS failure we can fix, those that don't want to discuss it often won't want to work out if it's that.

Try OPENDNS and see if the site works.

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Comcast blocking legit sites now!?!?
by JimChicca / February 18, 2011 6:22 AM PST

I forgot to mention that I have also tried the IP address.


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Then back to Comcast.
by R. Proffitt Forum moderator / February 19, 2011 12:54 AM PST

But what I find when I've been lucky enough to test this firsthand is that it's something else. That is, my laptop worked and their machine didn't.

Causes are all over the map from firewalls, malware damage, the HOSTS file and other.

The roughest one found the issue to be at the server site that it's ISP had blocked the other ISP in an attempt to block some denial of service attack.

Good luck and hope you figure it out.

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Then back to Comcast
by JimChicca / February 19, 2011 6:02 AM PST
In reply to: Then back to Comcast.

I spend about an hour with the technicians and it finally got straightened out. After trying several things, it started working. We have no idea what was going on, but I do think I need to apologize. It doesn't look deliberate.

However, they don't know what went wrong, so it could happen again.

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