Topic: Flash Crash on Mt.Gox today? (Read 2994 times)

This is more complex than just "view the frontpage".

The DDoS defense is dynamic both with respect to the source and with respect to the destination.

So you are having the situation where only certain API URLs get protection but not the viewed-by-hand URLs (destination filtering).

Your experience will also depend on the current global DDoS botnet density estimate computed by IP address (source filtering).

To compund the above Prolexic doesn't disclose the details as a matter of policy. This is because they always have botmasters buying their service for their own machines to reverse engineer the Prolexic's defense strategy.

Was anyone getting HTTP error codes eg. 429 or 504? Or just Prolexic's standard timeouts due to dropped TCP/IP packets?

I don't think the trading issues are related to DDoS protection. The DDoS issues experienced early last year didn't affect the trading engine, people couldn't even view the frontpage.

While there has consistently been issues with the trading engine (and especially websockets): rogue trades, orders stuck as "pending" for minutes, and most recently the two lock-ups (with websocks sending looping data in the second).

I think this thread should be renamed to "Flash Spike", since someone was someone was buying 50,000+ bitcoins, spiking the price to $9.30+ when Mt. Gox feed crashed...

Gox is up, but the trading is not working.
I put in several orders, and it keep showing pending.

No. Prolexic defense costs big bucks; bitcointalk.org is running bare in Networklayer's Dallas,TX facility.

Use robtex.com (or something similar) to check the IP address.

SO does that mean that everyone hitting Bitcointalk to post "what the hell is going on with Gox" messages is then interpreted as a DDOS and that's why the forum also goes offline?

Mt. Gox is setup behind the anti-DDOS proxy from Prolexic.

Any spike in viewing/trading activity is treated as a DDOS by Prolexic and "successfully blocked".

This will keep happening until Mt. Gox implements professional trading protocols, not various ad-hoc stacks over HTTP/HTTPS.

Really. Do tell.

Seriously, start thinking - stuff goes down because MtGox is the SOURCE of the information. It would affect any service that relies on the information supplied from the MtGox API, including Clark's site, btccharts, MtGoxLive itself, various bots, and more.

Bitcoin transactions to MtGox accounts can never be affected by them in terms of speed. Transactions FROM them however may be slower because they send them without fees, so slowness is expected for the first confirmation. However they would be slow any time, not just at certain times. Deepbit has a limit on the number of "free" transactions that they will process, and for a good reason too.

And as for bitcointalk going down, I don't know what caused the most recent downtime but to say it happens on every spike up or down is major BS. Even though it is hosted by Tibanne, that doesn't mean that they would just bring it down for some reason. Although it's just speculation, my personal guess is that the spike caused a virtual machine that runs the matching engine to balloon in memory size, shutting down other VMs in the process due to out-of-memory conditions. That is just a guess, though.

And as for the hardware itself, I don't know what they run currently, but there have been posts in the past that indicate a pair of high powered servers with around 96GB of RAM set up for failover. Not really small potatoes.

U could get the answer by urself. Just think of why such things as...

- BTC price on Mt. Gox is changed very fast in one direction
- Mt. Gox becomes very laggy
- bitcointalk.org becomes unaccessible
- BTC transactions to/from Mt. Gox accounts are processed much slower (who owns deepbit btw?)
- monitors like btccharts.com stop showing recent information

...happen all at once.

PS: Don't post here BS that Mt. Gox can't afford to buy better hardware. It's just profitable for them to pretend they're unable to process a lot of data during critical market events.

That's reassuring...

Lol, they all get their info from Gox because that's where the info is made, no conspiracy, relax.

The out of range price is because Gox doesn't have good matching software, it's been happening for 2 years.

I'm not the first time I've noticed that all services are falling at one moment. This is all under one organization? What the hell? Puppeteer has the ability to pull the strings all at once?

There was a brief crash today from 8.58 down to 8.22 then immediately back to 8.52 within single digit seconds.

Result: Clark moody promptly died, btccharts stopped ticking, Mt. Gox went unresponsive for the duration, and bitcointalk went down for a minute or less.

Someone bought several thousand bitcoins at (up to) 0.36 USD below market on Mt.Gox. Can someone explain this anomaly?