Error message

[Anonymous]

Jeff,

I've been getting the following error message often in the past couple of days. Any idea why?


Response Error.

Technical description:
502 Bad Gateway - Response Error, a bad response was received from another proxy server or the destination origin server.

Thank you

[jsteele]

This is a difficult error to troubleshoot. A proxy server is a server between you and the server that provides the content you are trying to view. Between you and DCUM, there are likely multiple proxy servers. We have one which is the server to which you initially connect. That proxy server load balances requests between two servers. If one of the second servers was slow to respond or gave an unexpected response, it would generate that error. However, there should be lots of users getting the error and, so far, you are the only one I know of.

More likely, there is another proxy server closer to you. Do you only get this error when using the connection from which you posted this message? For instance, if you just posted from home, do you have the problem at work as well or vice versa? Do you use both a regular computer and mobile (iPhone, iPad, etc.) and have the same issue with both, or just one?

Because there are a lot of possible variables, we will have to consider lots of possibilities.

[Anonymous]

jsteele wrote:This is a difficult error to troubleshoot. A proxy server is a server between you and the server that provides the content you are trying to view. Between you and DCUM, there are likely multiple proxy servers. We have one which is the server to which you initially connect. That proxy server load balances requests between two servers. If one of the second servers was slow to respond or gave an unexpected response, it would generate that error. However, there should be lots of users getting the error and, so far, you are the only one I know of.

More likely, there is another proxy server closer to you. Do you only get this error when using the connection from which you posted this message? For instance, if you just posted from home, do you have the problem at work as well or vice versa? Do you use both a regular computer and mobile (iPhone, iPad, etc.) and have the same issue with both, or just one?

Because there are a lot of possible variables, we will have to consider lots of possibilities.

I got it too, several times from my iPhone yesterday. It seemed to resolve itself after a while.

[Anonymous]

This is the OP. I get that message on my iPad only. I am posting from my iPhone now and I haven't tried my desk or laptops yet.
It was intermittent in the last couple if days but today I get the message every time I try to log on using my iPad.

[Anonymous]

OP again. I googled how to solve but am not tech savvy enough to understand most of the solutions. The one I do understand- clearing cache and cookies- I've done, but the problem persists.

[jsteele]

Anonymous wrote:OP again. I googled how to solve but am not tech savvy enough to understand most of the solutions. The one I do understand- clearing cache and cookies- I've done, but the problem persists.

I assume that your iPad is using wifi to connect. So, please go to this website:

http://whatismyipaddress.com

using your iPad and then post the IP address shown using your iPhone. I'll check for any blocks or other issues on our firewall.

Thanks!

[Anonymous]

Thanks. Ill try that now. Also I only have this problem with DCUM.

[Anonymous]

How can I send to you privately?

[jsteele]

Anonymous wrote:How can I send to you privately?

Yes, if you want to. Just use the "report" button.

[Anonymous]

jsteele wrote:

Anonymous wrote:How can I send to you privately?

Yes, if you want to. Just use the "report" button.

Thank you for your help Jeff. I've sent it.

[jsteele]

I've fixed the problem. You have the misfortune to share an address pool with a notorious poster that I've been trying to block. I'll have to find another means.

[jsteele]

BTW, the error message must be coming from a proxy server on Verizon's network. That error message is extremely unhelpful. Since I was blocking the IP address, the message should have been "Connection Refused".

[Anonymous]

Thank you Jeff. I thought IP addresses were unique.

[jsteele]

Anonymous wrote:Thank you Jeff. I thought IP addresses were unique.

When the most widely used version of Internet Protocol (IP) was introduced, nobody expected there would be so many devices using the Internet. As a result, it eventually became obvious that all available addresses would soon be utilized. To slow down the day that all were used, several techniques were introduced to conserve them. One is Network Address Translation (NAT). This is commonly used on home networks. If you have a Verizon connection to your home and own an iPad, a laptop, a desktop, etc., all of them probably use non-routeable "private" IP addresses. When you connect outside your home network, those addresses are translated to a public, routable address. So, all of your devices appear externally with the same address. Moreover, that address may be dynamically assigned to you. That means that when a public address is needed, your router requests one from Verizon and a address is "leased" temporarily. When your lease expires, it may be renewed, or you may get another address leased to you. These temporary addresses come from a pool of addresses. On top of all of this, Verizon appears to be using proxy servers which also use a type of address translation. Your device connects to the proxy server, which connects to the destination server and acts as a go-between between you and the destination server. The address that shows up on the remote end -- DCUM's end in this case -- is the address of the proxy server. There could be any number of users behind that server all showing up as one.

So, no, IP addresses are not unique. One address could be shared by thousands of people and that address could change daily.

[Anonymous]

OP here. Blimey, sounds frightfully complicated but I think I get it and thank you very much, the problem is fixed.