electrum server returned an error, The development server returned response error code 500 react native jobs

Loopring, the road-print protocol, tweeted earlier that there was a problem with the AWS server and that Loopring.io was temporarily unstable. Subsequently, Loopring updated to say that repeater services had returned to normal. The problem is caused by an ELB port configuration error.

Electrum Technologies runs a central server to facilitate these exchanges for a fee. This allows users to purchase incoming capacity to receive lightning payments. The developer added.

This configuration means that whenever a threat is detected, the access is blocked using the deniy keyword, and a 403 error code is returned to the server.

500 (Internal Server Error) The server encountered an error and was unable to complete the request. The 501 (not yet implemented) server does not have the ability to complete the request. For example, this code may be returned when the server does not recognize the request method. The 502 (Error Gateway) server, acting as a gateway or proxy, receives an invalid response from the upstream server. 503 (Service unavailable) server is currently unavailable (due to overload or downtime maintenance). Usually, this is only a temporary state. The 504 (gateway timeout) server acted as a gateway or agent, but did not receive requests from the upstream server in a timely manner. The 505 (HTTP version is not supported) server does not support the HTTP protocol version used in the request.

A botnet with more than 140,000 machines has launched a DoS attack on the server of Bitcoin wallet Electrum in an attempt to direct users to software versions designed to steal bitcoins, Theextweb reported. Electrum users have been advised to take extra care when using the platform until the issue is resolved. Security researchers familiar with the matter say that if a user installs a fake version of Electrum, all funds contained in the old version will be lost immediately.

Electrum is a world-renowned Bitcoin light wallet with a long history of multi-signature support and a very broad user base, many of which like to use Electrum as a cold wallet or multi-signature wallet for Bitcoin or even USDT (Omni). Based on this usage scenario, Electrum is used less frequently on the user's computer. The current version of Electrum is 3.3.8, and previous versions of 3.3.4 are known to have "message defects" that allow an attacker to send an "update prompt" through a malicious ElectrumX server. This "update tip" is very confusing to the user, and if you follow the prompt to download the so-called new version of Electrum, you may be tricked. According to user feedback, because of this attack, stolen bitcoins are in the four digits or more.

Although I don't think the HWI project is as friendly as Electrum Personal Server at the moment, it should reduce the number of independent software components required.

5xx (server error category)

5xx (server error category)

In December 2018, Slow Fog first discovered and alerted an attacker to a messaging flaw using the Electrum wallet client to force an update prompt to pop up when a user transfers money, inducing users to update and download malware to carry out a currency theft attack. Recently, slow fog technology anti-money laundering (AML) system through continuous tracking found that one of the attackers wallet address bc1qc... p2kny has stolen more than 30 BTCs for six months and has been active recently. Slow Fog alerts Electrum users to update prompts, the new version of Electrum in this update prompt is likely to be false, if installed, please promptly transfer Bitcoin out in another security environment. At the same time, slow fog called on the vast number of cryptocurrencies exchanges, wallets and other platforms of the AML wind control system black and monitor such as the above Bitcoin address. This update tip is a phishing attack by an attacker who exploits a message flaw on the Electrum client and the ElectrumX server, which requires the attacker to deploy the malicious ElectrumX server in advance, and the malicious server is localized by the user's Electrum client (because the Electrum client is a light wallet and the user needs the ElectrumX server to broadcast the transaction). At the time of the madness, malicious ElectrumX servers accounted for as many as 71% of the total, and according to incomplete statistics, hundreds of bitcoins have been stolen in this phishing attack over the past year or so. Although in early 2019 Electrum officials have said they want to adopt some security mechanisms to prevent this kind of update fishing, such as: 1. Patch Electrum client does not display rich text, does not allow arbitrary messages, only strict messages; Patch ElectrumX server implementation detects Sybil Attack (i.e. witch attacks, malicious servers that send phishing messages) and no longer broadcasts them to clients; Implement blacklisting logic to alert malicious servers outside the Electrum client view; Promote social networking sites, websites, and all forms of communication that exist with users, who should always run the latest version and always only install from official sources (electrum.org), access through security protocols (https), and verify GPG signatures in advance. However, many users of Electrum are still in the old version (less than 3.3.4), the old version is still under threat, but slow fog does not rule out that the new version will have a similar threat.

An attacker generates an HTTP request for cacheable resources, but includes error fields in the request that can be ignored by the caching system, resulting in an error in the source server processing, and then the problem arises.

electrum server returned an error

electrum server returned an error

Solidity's underlying call method, such as address.call(), does not throw an exception. Instead, false is returned when an error is encountered.

During an active exception-based scan, Freddy injects test data into an HTTP request and attempts to trigger an exception or error message. If an error message is observed in the response information returned by the target application, there is a security issue.

Ormandy said that when he discovered the problem, another sharp-eyed researcher had returned the vulnerability as early as November 25, 2017, but Electrum.

The fact that not many people know is that Esplora is bundled with a based and optimized Electrum server. This Electrum server is derived from Electrs and is now maintained separately by the Blockstream engineering team. Over the past two years, Esplora has become one of the fastest and most scalable Electrum server solutions available for Bitcoin due to continuous updates and performance optimization. Esplora is also the only Electrum server that supports liquid networks.