Help? Cloudflare and ISP Host Conflicting over IP Address

Kristi Bryant kbryant at WELLSTOWN.ORG
Tue Mar 15 17:27:38 EDT 2016

Is there a specific port that needs to be opened up?

I’d ask both vendors.

Good luck,


Kristi Bryant
Adult Services Librarian
Wells Public Library
1434 Post Road
Wells, Maine  04090
207-646-8181 ext. 205
E-mail:  kbryant at

"Google can bring you back 100,000 answers, a librarian can bring you back the right one."  Neil Gaiman

From: Web technologies in libraries [mailto:WEB4LIB at LISTSERV.ND.EDU] On Behalf Of Cary Gordon
Sent: Thursday, March 10, 2016 9:35 AM
Subject: Re: [WEB4LIB] Help? Cloudflare and ISP Host Conflicting over IP Address

If one IP address affects a lot of your users, it begs the question of what lives at that IP address? The Great Firewall of China, perhaps?

Perhaps is is on a list by domain name or host name.



On Mar 9, 2016, at 2:55 PM, Blatchley, Carolyn <cblatchley at CCPA.NET<mailto:cblatchley at>> wrote:

We have a Drupal site hosted with a service provider. We also have Cloudflare for filtering out DDoS attacks.

Recently, traffic to our webserver appeared to be blocked by Cloudflare. Through investigation, we narrowed it down to one IP address that Cloudflare uses which is not getting through to our hosting provider.

Our provider (who recommended using Cloudflare) insists that the IP address in question has been whitelisted. However, every time we re-enable Cloudflare, our site is unreachable and the tech people at Cloundflare say that they can see their IP address being blocked by our host. This results in our site appearing to be down.

Does anyone have thoughts on how we can resolve this? The two companies both blame eachother, and our library customers are frustrated by the site going down frequently.

Thanks in advance for any help you can provide.

Carolyn Blatchley, MLIS
Public Services & Staff Training Coordinator
Cumberland County Library System
1601 Ritner Hwy, Suite 100
Carlisle, PA 17013-9304
717.240.5379 | cblatchley at<mailto:cblatchley at>

The information in this message may be privileged and confidential and protected from disclosure. If the reader of this message is neither the intended recipient, nor an employee or agent responsible for delivering this message to the intended recipient, then you are hereby notified that any dissemination, distribution, unauthorized use, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to this message and deleting it from your computer. Thank you, Cumberland County, PA.   ­­   ============================
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