Internet problems for some Comcast users Feb 19 2015 (resolved)

2:16 PM Pacific time: We’re receiving scattered reports that some Comcast users, particularly in the San Francisco Bay Area, are unable to reach some sites on our servers (but others are fine).

This appears to be a general Comcast problem; there are many similar reports on Twitter unrelated to us.

Update: The problems were resolved by Comcast at 4:23 PM Pacific time, according to several Internet reports and our own testing.

Routing problem for some East Coast users August 29 2014 (resolved)

Earlier today (August 29, 2014), some people in the US Southeast who use certain ISPs were unable to reach our servers. This was caused by a problem at a third party that has been resolved.

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Routing problem for some East Coast users (resolved)

We have gotten quite a few reports from users on the East Coast that they cannot connect to their Web sites on our servers, to our Web site, or to our e-mail servers.

Analysis shows that the problem is with a network called which is between them and our servers. When you make a connection to a remote server, the connection travels from your ISP, through several different intermediary networks, and finally to the destination network and server. Each of these networks needs to properly “route” the connection to the next closest node to the destination. The current problem seems to be that the data packets are getting lost within the network.

You can verify this by running the command “tracert” on Windows, or “traceroute” on Mac (Terminal). You’ll see that your packets can get through your ISP, but after they get handed off to the packets get lost. (A line that ends with *** is a failure.)

While you may have a problem in the network route between your computer and our servers, most other people on the Internet use different routes and can continue getting to your site just fine. You can also verify this with third-party sites, such as

This sort of problem is not uncommon, but is usually resolved within a few minutes. It’s up to to fix their routing; we presume they are working on it.

Update 9:56 AM (Pacific time): It looks like has fixed their problem. We see that customers who had been having problems can now reach their Web sites (and our site) successfully. Please note that no incoming e-mail was lost during this. Any incoming e-mail would have queued up for later delivery, and will get redelivered to our mail servers (soon, if not already).

Even though the cause of this problem was out of our hands, we certainly regret the inconvenience that it caused those who were affected.

Network attacks July 26, 2012 (resolved)

Today at about 12:26 PM and 12:34 PM (Pacific time), our network was briefly attacked by an extremely high volume of data — a “distributed denial of service” (DDoS) attack using forged (“spoofed”) source addresses. The volume of the attack was more than 50 times greater than the usual peak inbound data rate to all our servers combined. This caused Web sites and e-mail we host to be very slow or timeout completely for a few minutes. (All services are working normally now.)

The same attack happened a week ago. Based on what we learned previously, we were able to trace the attack in more detail, and we have identified a specific controversial site that the attackers are targeting. We have moved that site to a different section of our network that can fail without affecting other sites, and we will work with the site owner to move it to a dedicated DDoS protection service.

We apologize for the problems caused by this incident. We know that achieving maximum uptime and availability is important for all of our customers.

Network connectivity problems June 15 (resolved)

Between 5:10 and 5:22 A.M. Pacific time this morning (June 15), one of our upstream network providers experienced a large distributed denial of service attack (DDoS) targeted at one of their other customers, overwhelming their core network routers. This resulted in many people being unable to connect to our network during this period.

The problem has been resolved (the provider has blocked the attack), and they tell us it should not recur. We sincerely apologize for the inconvenience this caused.

Network issues January 3, 2011 (resolved, updated)

Between 3:29 PM Pacific time and 3:33 PM Pacific time, our monitoring systems detected that most Internet users could not connect to our primary data center. E-mail delivery was properly queued up and delayed during this period.

We will follow up with the data center team, but the problem appears to have been resolved, and all services are operating normally. We’re continuing to monitor it closely, and we sincerely apologize for the inconvenience this caused our customers.

Updated: connectivity was lost for four minutes because the data center was fighting off a severe DoS attack.

Network slowness for some customers (resolved)

Between 7:00 and 7:45 PM Pacific time Thursday night (March 11), we received two reports of slow or nonexistent network connections to sites on our servers.

Our automated monitoring systems didn’t detect any general problems, so the majority of customers were certainly unaffected — but we suspect that one of the “Internet backbones” between the affected customers and our data center had high packet loss during that period.

Both customers reported that the problem resolved itself by 7:45, and we haven’t received similar reports since, so there does not appear to be be an ongoing problem. We’ll continue to monitor it closely.

Network problem earlier today (resolved)

Some of our customers may have noticed “high packet loss” today from about noon to 12:25 PM (Pacific time). This could make it seem like Web sites hosted on our servers were loading slowly, or even timing out.

The problem has been resolved by our upstream provider, but we are working with them to make sure it doesn’t recur.

Routing problem for some Comcast customers (resolved)

Between 5:11 and 5:46 PM Pacific time today, some people who reach our servers via an “Internet backbone” called Global Crossing (including some Comcast cable customers) were unable to connect to our data center. Other users weren’t affected.

Global Crossing has apparently corrected the problem, and everything is now operating normally. We’ll continue to monitor this issue closely.

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Slow server response for some customers (resolved)

Since about 9:00 AM (Pacific time) this morning, we’ve been seeing network routing problems to some destinations on the Internet that use the “” backbone. For some customers, this will have the effect of making any access to your web site extremely slow — it may even be so slow as to seem completely non-responsive. Most customers will have no problems.

Our data center technicians are working on this problem. We’ll update this post as soon as the issue is resolved.

Update: This issue was resolved at approximately 10:20 AM, and all systems are operating normally.