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big brother, there are so many conference centers abroad. Which country are you going to? Be specific! There are many in New York!
change DNS: Network Neighborhood - & gt; Attribute - & gt; Your properties on your broadband connection - & gt; Network - & gt; Internet Protocol - & gt; Use the following DNS server
to view it in the same way! You can also search the DNS server in your area on the Internet and change it
attachment:
any application based on TCP / IP under windows must access the network through Winsock interface, which provides a high-level data transmission programming interface independent of the underlying transmission protocol. In Windows system, Winsock interface is used to provide network access service based on TCP / IP protocol for application program. Now that the file is damaged, of course, we can't surf the Internet. But why can we chat with Tencent QQ? We know that the communication on the Internet is based on TCP / IP protocol. TCP / IP protocol is divided into TCP and UDP. QQ uses UDP to communicate, but Winsock damage does not affect the normal transmission of UDP. This is the reason why we can't surf the Internet, but we can chat with QQ
recently, I found that many netizens can't browse the web but can chat with QQ. It's true that too many people have asked. In order to solve your doubts, I will collect some information and discuss with you how to eliminate this fault Pour a cup of tea first) of course, I just want to analyze the common faults with you, and the specific situation needs to be analyzed. You can refer to several situations and take corresponding measures, hoping to bring help to you
1. Browser & quot; Connect & quot; Option setting error
solution: set the Internet type correctly. If you are surfing the Internet through proxy service, please fill in the IP address and port number of the proxy server correctly; If not, please do not check & quot; Through proxy server & quot; This is the option
2. DNS server setting error
solution: if the ISP provider assigned you a fixed IP address, please fill in the IP address provided by ISP and DNS server address correctly; If the ISP provider assigns a dynamic IP address, there is no need to fill in the DNS server address; Another possibility is that the DNS server of the ISP provider has made an error and can't convert the domain name to IP address correctly. At this time, you can type in the IP address of the website in the address bar of the browser to browse the web page
3. Firewall setting error
solution: if the firewall is not set properly, it may block the exchange of information with the Internet, resulting in the failure of browsing the web page. We can modify the firewall settings. What? How? I don't need to say that. Well, let's just say that for those who don't know you, you can directly choose the default level, which is & quot; Middle & quot; That's it< Case 2: ADSL can successfully log in but can't browse the web page.
first, you should Ping ISP's DNS server address to see if you can ping. If you can ping, most of the problems are software problems. If you can't Ping, you should check the hardware device / line connection status and communication protocol (TCP / IP)
if you can ping, You can see the following information:
command: pinga. B.c.d
replyframa. B.c.d: bytes = 32time = 14msttl = 250
replyframa. B.c.d: bytes = 32time = 27msttl = 250
replyframa. B.c.d: bytes = 32time = 20msttl = 250
replyframa. B.c.d: bytes = 32time = 17msttl = 250
if you can't Ping, There will be the following information:
pinging a.b.c.dwith32bytesofdata:
timeout
timeout
timeout
1. Friends with multiple computers can replace them with other computers. The replaced computers do not install any proxy server software or firewall, and only install one network card to directly connect with adslmodem, After the ADSL dialing software is installed correctly. See if you can browse normally. If you can, the fault is caused by the client's computer. If not, you need to check whether the modem and the line are normal
2. Friends with only one computer can stop running all proxy server software, such as Internet connection sharing (ICS) of Wingate, Sygate and windows, and log in directly to see if the fault can be eliminated. If the fault can be eliminated after stopping running proxy server software, it is definitely the problem of proxy service software
3. Check the settings of the browser, especially ie. for example, the most common fault that causes unable to browse the web page is that & quot; is selected in ie; Automatic detection settings;, Remember not to choose this option. If it is ie5x version, you can see this option by clicking Tools Internet Options connection LAN settings. If this option is checked, you must cancel it. After cancellation, the fault can be solved
4. Check the property settings of TCP / IP protocol, especially whether the DNS server settings are correct. In particular, the location of setting DNS is different for different dial-up software. Some settings are set in the properties of connection icon of dial-up network, some in the control panel network, and some in the connection profile property of dial-up software (such as enternet300). These three places must be set correctly
5. Friends who use windows can prepare ADSL dialing software and windows system CD-ROM if they are confirmed to be correct after the above check, then delete the dialing software first, and then delete all TCP / IP protocols in the control panel / network, restart the computer, add TCP / IP protocol again, turn on modem power, and re install the dialing software, If the setting is correct, most of the problems can be solved by re installing the dialing software and TCP / IP
6. Change a browser software, such as Netscape's Netscape browser browsing test
7. If the computer that you directly connect to adslmodem is equipped with two network cards, try to pick up the network card that connects to the local area network first, leaving only the network card that connects to adslmodem. Then see if the fault is removed. If the fault is removed, check the network and system resource configuration. Especially to see if there is any conflict between the network card and other devices (Windows users can check whether the device is normal in the control panel / system / device management)
8. Your network card has bootrom chip boot function, and the network card has PXE boot chip. It can be solved as follows:
① if the network card is integrated on the main board, or the online boot program is written into the BIOS, you can modify the boot order of the system from the BIOS settings, such as setting the hard disk to boot first, or forbidding the network card to boot the system from the BIOS
② if the network card is not integrated, you can unplug the boot chip on the network card or use the network card setting program to disable the bootrom boot function of the network card, or you can shut down the network card. Then when & quot; PressShift-F10Configure......" Press & quot; Shift+F10" After entering the menu, set bootorderom to disable from line 4, and then press F4 to save and exit
case 3: sharing the Internet can't browse the web page
after using the machine of Windows XP system as the proxy server, it is found that other computers in the LAN can't browse the web page, but there is data flow, QQ and other software can also be used, and each machine in the network can also visit each other. The proxy server is a al network card, which is set to & quot; in the network configuration wizard; Other computers in the network access the Internet through their own computers Connect LAN through a network card), and set it to & quot; B connection shared to the network & quot The second one is B network card. The client is set to & quot; Access to the Internet through other computers in the network;, The operating system has windows 98 / 2000 / XP, which is connected by switch. The proxy server connected to the switch has two lights working normally (a, B network card and broadband modem connection), but the light on the client is only occasionally on. When you open a web page, you can see & quot; in the status bar; Opening webpage & quot; But I couldn't see the web page for a long time, and finally & quot; Web page cannot be displayed & quot; It's a good tip
solution: there may be a problem with your network cable connection and DNS settings:
① make a cascade line to connect the a network card directly to the broadband ADSL, and do not move the others
② set the IP addresses of other clients as 192.168.0.2, 192.168.0.3, 192.168.0.4,..., set the subnet mask as 255.255.255.0, set the gateway address of each client as 192.168.0.1, and set DNS as the DNS address of your ISP
at the same time, you can also consider whether there is a conflict between the proxy server and the network card. It is helpful to replace the PCI slot and remove the peripheral devices that are not needed for the time being
the common phenomenon of ADSL disconnection
the web page cannot be opened, the download is interrupted, or the online video and audio stream is interrupted. These are the troubles that many people who use ADSL to access the Internet will encounter. However, when you carefully check the status of adslmodem, you will find that the dial-up login has been successful. So what's the problem
1. The line is unstable
if the residence is too far from the telecommunication office (more than 5 km), you can report to the telecommunication department. Make sure that the line connection is correct (different voice separators have different connection methods. Please connect correctly according to the instructions). At the same time, make sure that the line communication quality is good, and there is no interference, and there is no connection with other equipment that will cause line interference, such as telephone extension, fax machine, etc. And check whether the junction box and crystal head have poor contact and whether they are wound in series with other wires. If possible, it's better to use standard telephone line. It's better if it's Cat3, CAT5 or CAT5. When the telephone lines enter the house, they go separately. First line calls, first line computers. If you want to install telephone extension in your living room, you'd better choose the junction box with good quality. The PC is connected to the twisted pair attached to adslmodem Note: the mobile phone must not be placed next to the adslmodem, because the mobile phone will automatically find the network every few minutes. At this time, the strong electromagnetic interference is enough to cause the adslmodem to cut off the current.)
2. Check your network card, if it's isa network card, it's better to replace it with PCI network card, and choose a high-quality network card, too cheap network card may be the main cause of the problem. 10m or 10m / 100M adaptive network card can be used. In addition, the conflict caused by the al network card is also worthy of attention. At this time, you should pull up the network card connected to the LAN or other computers, and only use the network card connected to ADSL to test the Internet. If the failure returns to normal, check whether there is any conflict between the two network cards
3. The adslmodem or network card settings are wrong
the most common is to set the wrong adslmodem IP address or DNS server. Because for ADSL virtual dial-up users, there is no need to set the IP address, which can be automatically assigned. TCP / IP gateway generally does not need to be set. In addition, if you want to set DNS correctly, if the operating system is Windows 9x, type winipcfg in DOS window to get DNS address, and in W
Fire coin launched "heco" on December 10, 2020, fire coin global station issued an official announcement. In order to help developers build decentralized applications flexibly and efficiently, fire coin announced the official launch of the eco chain Huobi eco chain (hereinafter referred to as "heco")
Huobi eco chain (heco) is a decentralized, efficient and energy-saving public chain. It is also the first proct launched by Huobi open platform, which realizes the compatibility of smart contracts on the basis of supporting high-performance transactions
heco
the original digital asset of heco is HT, which adopts HPOS consensus mechanism. Heco is the public chain infrastructure of fire coin open platform, and will become the basic platform for carrying users, assets and applications in the future. Heco is not only a public chain, relying on the world's largest trading ecology, heco will become the birthplace of innovative technology and business, and build a complete ecological closed loop of technology development, application promotion and trading. Through this ecological closed loop, Huo coin open platform and heco will fully complement each other in resources, provide more diversified innovation paths and basic services for global developers, and make the construction cost of decentralized applications lower and more efficient
As of January 27, 2021, the data shows that heco has 48 deployment projects, more than 170W non-zero addresses, and TVL more than $1.197 billionthe Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system
in the power system, SCADA system is the most widely used and the most mature technology. It plays an important role in the telecontrol system. It can monitor and control the operation equipment of the SCADA system to realize the functions of data acquisition, equipment control, measurement, parameter adjustment and various signal alarms; Four remote & quot; Functions. RTU (remote terminal unit) and FTU (feeder terminal unit) are important parts of it. They play a very important role in the construction of integrated substation automation nowadays.
SCADA (supervisory control and data acquisition) system, that is, data acquisition and monitoring control system, involves configuration software, data transmission link (such as data transmission radio station, data acquisition system, etc.) GPRS, etc.) instrial isolation security gateway, in which the security isolation gateway is to ensure the safety of the instrial information network, most of the instry will use this kind of security gateway to prevent viruses, in order to ensure the safety of instrial data and information. One of the isolation gateways is: instrial safety protection gateway psafetylink, or isolation gateway for short.
it has a wide range of applications, and can be used in data acquisition, monitoring and control, process control and many other fields in electric power, metallurgy, petroleum, chemical and other fields
DCS is the abbreviation of distributed control system, which is also called distributed control system in domestic automatic control instry. It is a new type of computer control system relative to the centralized control system. It is developed and evolved on the basis of the centralized control system
it is a multi-level computer system composed of process control level and process monitoring level, which is connected by communication network. It integrates 4C technologies such as computer, communication, display and control. Its basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration and convenient configuration
in special control fields, such as nuclear power plant control system, DCS is mistakenly called digital control system, and its essence is still distributed operating system.