opc gateway

, any WAN is much slower than a LAN. This means that the network used by the mobile local client differs greatly from the performance characteristics of the server-side Web application's LAN. A server-side web app can send a large number of requests to the back-end service without impacting the user experience, but the mobile client can only send a small number of requests.• The number of service instances and their location (host + port) are dynamically changed.The service may change over time,

Some websites that run on Nginx sometimes appear "502 Bad Gateway" errors, even when they occur frequently. The following is a small compilation of some of the Nginx 502 error troubleshooting methods, for reference:The reason for Nginx 502 error is more because of a problem with the backend server in proxy mode. These errors are generally not the problem of nginx itself, be sure to find the reason from the back end! But Nginx put these mistakes are in

CenOS gateway encountered a problem when our company used PacketiXVPN. After a long time, I did not solve the problem, so I found out the problem by looking for their technical staff to completely simulate our network environment. it is representative and I will share it with you. Network environment... CenOS gateway problems A problem occurred when we used PacketiX VPN. After a long time, I did not solve

First, the concept of the Gateway: Gateway, also known as the Inter-Network connector, protocol converter. The gateway realizes network interconnection above the network layer, is the most complex network interconnection device, only for two high-level protocol different network interconnection. Gateways can be used for both WAN interconnection and LAN interconne

it?Let's start with some of the things that this architecture needs to do and the shortcomings that exist: first, It destroys the service stateless Feature. In order to ensure the security of the external services, we need to implement the access control of the service, and the Open service control mechanism will run through and pollute the entire open services business logic, This will bring the most direct problem is that the service cluster of the rest API stateless Features. From t

this time, Nginx cannot transfer the PHP file to PHP-FPM processing, so the CPU will be reduced to very low (not to handle PHP, not to execute SQL), and the load will rise to very high (close and open children, nginx wait php-fpm), the network card traffic is also reduced to very low ( Nginx cannot generate data transfer to client)Solving the problem is simple, increase the number of children, and set max_requests to 0 or a larger value, restart PHP-FPMThe implication of Nginx 504

Virus Detection mechanism: a virus is a piece of code, and the final form is a file. Any data streams that are transmitted on the Internet must be composed of files to be detected by the anti-virus scanning engine. When browsing the Web page, we actually get a lot of html files, gif icons, and script files through the http protocol, and the files will eventually arrive at the user's place. To implement http virus filtering, the gateway anti-virus prod

Ocelot gateway, Ocelot is. the open-source project of the gateway under the net core framework is the basic implementation diagram provided by the official team, that is, to unify multiple backend services to the gateway, front-end applications: desktop, web, only the Access Gateway can be used on the app side. The im

Article Title: Build a Linux Mail Gateway and mail system. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Environment: vmware RedHat EL3 x 3 ServerA ip: 192.168.0.231 Mail Gateway server DNS server ServerB ip: 192.168.0.20.email system server ServerC ip: 192.168.0.233 e

VRRP (Virtual Router Redundancy protocol) is the industry standard Gateway Redundancy Protocol, HSRP (hot standby Router protocol) and GLBP (Gateway load balance Protocol) is a Cisco private protocol.Set the same virtual IP address on two or more gateway devices (and they have a physical interface IP address, respectively), and the

If you have a SIP account from a carrier, you can configure the SIP to dial an external phone. The SIP account (or the device providing the account) is referred to as the SIP gateway in FreeSWITCH. Adding a gateway only needs to create an XML file in conf/sip_profiles/external/, with a name that can be randomly used, such as Gw1.xml, and then enter the following code in the file:If you need additional param

Two such problems occur: ADSL can be connected normally, but the Internet cannot be accessed after connection. Ping the command to ping the gateway. Fans Cause: the Winsock2 fault or the file is damaged. Solution: Use the Super Rabbit ie repair expert, which has a tool "strong repair Winsock2". Click Run To fix Winsock2. Restart your computer to access the Internet.(If not, reinstall the system .) ######################################## ######

The deployment structure adopts turbogate as the Mail Gateway and Exchange Server 2007 as the intranet mail system. This deployment method prevents the Intranet exchange mail server from being directly exposed to the Internet, instead, it uses the SMTP protocol to access the Internet through the turbogate Mail Gateway, thus ensuring the security of the Intranet exchange mail server.I. topology structureIi.

App Gateway on Azure is a seven-tier load balancing service, and WAF is an extension of App Gateway services. The seven-tier load balancer adds the functionality of the WAF to protect the HTTP service in the background.Azure WAF is based on the WAF functionality implemented by the open source modsecurity owasp core rule sets. Please refer to Modsecurity's website for details: https://modsecurity.org/The cur

Deployment environmentCentOS 7.4Zabbix 3.4Tomcat 6.0.32　　Server configuration 1, installing the JDKVersion to be confirmed at more than 1.7The following are the 7.0 and 8.0 versions of the JDK source packages:7.0JDK Source Package8.0JDK Source Packageand upload it to Zabbix server.Create the installation directory, download and unzip the installation to this directory# mkdir/usr/local/java/# TAR-ZXVF jdk1.7.0_67.tar.gz-c/usr/local/java/After the installation is successful, mention th

The general VPS Gateway is not changed, and the single suit also applies. First, view the current gateway Arp-a SSH executes the above command to view the gateway host name, Gateway IP, Gateway MAC address and the corresponding network card, as shown below Second, bind

API Gateway is a very important part of the microservices architecture, there are many different services provided to external use, API gateway can be a unified portal, can also be done on the gateway for protocol conversion, permission control and request statistics and limit flow and other workSpring-cloud encapsulates the open source API

I. Implementation Environment Oracle Database Server 172.16.4.165 Windows Server 2008-64bit Oracle11g R2 DB2 database Server 172.16.4.165 Windows Server 2008-64bit DB2 V9.7 Oracle gateways11g R2 transparent gateway Server 172.16.4.20.windows Server 2003-32bit 2. Install the oracle transparent gateway server (172.16.4.20) Download the installation package win32_11gR2_gateways from the official Oracle website

The current communication methods are inseparable from the IP network. To combine the two, you must use the gateway. Now let's talk about the knowledge of Cisco's unified voice gateway. Which models are available in these products, and what are the differences between these models? Cisco Unified Communication Voice Gateway Cisco 1700, 2600XM, 2800, 3700 and 3800,

rather than databases. But at first the idea was inspired by Shenli's article, "Micro-SOA: Principles of Service design and practices", which was thought of in conjunction with other ideas. The idea is only a utility model at present, the specific use of the effect also needs further verification, but only for the small and medium-sized development team, in the early implementation of the micro-service can completely replace the API gateway. is a com