Ошибка cannot connect to the server

Before we get into the solution to the «Cannot connect to server» problem. Let’s look at some of the underlying causes of this scenario.

To begin, you must understand that when you use the internet, you are a part of a Client and Server Network. You, as a client, request the resource, and the server responds with the requested result.

Let’s say you want to open a web app or a website. This request is routed to the backend web server via a router and an ISP, and the server responds with all of the content you requested.

When there is a connectivity issue between the client and the server, you may receive an error message such as «Cannot connect to Server.»Actually, this appears to be a generic error message, and there could be many causes of the problem which makes troubleshooting difficult because you may need to know your computer, network card, local network, router, ISP, and the entire internet, status code, web server issue, client to server connections, server software, firewall, and many more. There is no such thing as a one-to-one problem and a solution to a problem. You must have a strong technical background in order to identify and solve the problem.

This error is similar to the generic error: Unable to Start Laptop. There could be several reasons for this, and determining the root cause of the problem can be difficult, necessitating the assistance of an IT expert. The same thing happens when the error message «Cannot connect to server» is displayed. We don’t know what’s causing the problem here. So let’s take a look at the various causes of them which might help you to solve the problem.

This issue applies to any website, app, game, mobile (android, ios), or browser (safari, chrome, etc)So, let’s look at the hit and trial method of the cause and solutions to it.

1 Client Firewall Blocking 

Your computer firewall may prevent you from accessing a specific website in order to get the required results, and you may receive the error message «Cannot Connect to Server.»

Solution 1: You can try disabling all firewalls at once and attempting to access the same website. You might be able to access the site if you’re lucky.

Here are steps for disabling the firewall in Windows OS

• Goto Run and type: firewall.cpl 
• Click on Turn Windows Defender Firewall On or Off

• Check the following two radio buttons:
  Under Private network settings: Turn off Windows Defender Firewall (not recommended)

  Under Public network settings: Turn off Windows Defender Firewall( not recommended)

  

  • Check the following two radio buttons:
    Under Private network settings: Turn off Windows Defender Firewall (not recommended)

    Under Public network settings: Turn off Windows Defender Firewall( not recommended)

  • Next, try connecting to the website.

  Note: You have to turn on your defender firewall to protect your computer.

  Solution 2: You can try another website, and if you are able to access another site, it is possible that the web server, routers, or ISP is blocking that particular site.

  2 Malware and Virus in your Computer and Server 

  Sometimes malware and Virus may block to access the website.

  Solution: You can try performing scanning on your computer against viruses and malware.

  3 Antivirus programs, anti-spyware programs

  Sometimes antivirus programs and anti-spyware programs might be blocking connections to the Internet.

  Solution: Simply try disabling antivirus programs and anti-spyware programs and try again.

  4 Router Firewall Blocking

  It’s possible that your modem or router has its own firewall. They may prevent access to the remote web server.

  5 Check third-party firewall

  If you are running any third-party firewall applications such as Anti NetCut3, Tinywall, ZoneAlarm Free Firewall 2017, PeerBlock or any other, then simply check the settings on those applications as well and make sure Games and Application is allowed through those programs, or disable the firewall program and check again to see if the issue with connectivity has been resolved.

  6Connection Problems between Your Router and ISP 

  There could be a problem with connectivity between your router and ISP. You send the request, it reaches the router, and the router sends it, but your ISP blocks it, or something similar happens.

  

  From your side, just restart your router. To restart your router, all you need to do is disconnect it from power for 30 seconds. After that, reconnect it to its power source and wait one minute for it to finish starting up. This resolves a significant number of connectivity problems.

  Also, you can seek help from ISP for identifying the problem.

  Also, you can try connecting to another network(if available).

  7 Client Cache

  The cache cannot be the source of these problems, but clearing the browser cache and cookies can sometimes resolve the issue.

  In google chrome, you can apply the following steps to clear caches and cookies.

  1 Launch Chrome on your computer.

  2 Click 3 horizontal dots in the upper right corner.

  3 Click More tools, followed by Clear browsing data.

  4 Select All time if you want to delete everything.

  5 Check the boxes next to «Cookies and other site data» and «Cached images and files.«

  6 Click the Clear data button.

  7 Now it’s better to restart your browser.

  8 Server Configuration and Fault   // Main Cause of the Problem

  The server configuration is the root cause of these errors. Server A  firewall may be preventing access to the website.There could be a disk failure, a RAM failure, a software problem, and so on in the server.

  You might have server errors like:

  • Internal Server Error 500
  • Not Implemented 501
  • Bad Gateway 502
  • Gateway Timeout 503
  • HTTP Version Not Supported 504
  • Variant Also Negotiates 505
  • Insufficient Storage 507
  • Loop Detected 508
  • Not Extended 509
  • Network Authentication Required 511 

  These are general issues, and if a client starts receiving these errors, they may become frustrated, so you simply receive Internal Server Error or an «Unable to connect to server» error.

  

  From your side, just restart your router. To restart your router, all you need to do is disconnect it from power for 30 seconds. After that, reconnect it to its power source and wait one minute for it to finish starting up. This resolves a significant number of connectivity problems.

  Also, you can seek help from ISP for identifying the problem.

  Also, you can try connecting to another network(if available).

  7 Client Cache

  The cache cannot be the source of these problems, but clearing the browser cache and cookies can sometimes resolve the issue.

  In google chrome, you can apply the following steps to clear caches and cookies.

  1 Launch Chrome on your computer.

  2 Click 3 horizontal dots in the upper right corner.

  3 Click More tools, followed by Clear browsing data.

  4 Select All time if you want to delete everything.

  5 Check the boxes next to «Cookies and other site data» and «Cached images and files.«

  6 Click the Clear data button.

  7 Now it’s better to restart your browser.

  8 Server Configuration and Fault   // Main Cause of the Problem

  The server configuration is the root cause of these errors. Server A  firewall may be preventing access to the website.There could be a disk failure, a RAM failure, a software problem, and so on in the server.

  You might have server errors like:

  • Internal Server Error 500
  • Not Implemented 501
  • Bad Gateway 502
  • Gateway Timeout 503
  • HTTP Version Not Supported 504
  • Variant Also Negotiates 505
  • Insufficient Storage 507
  • Loop Detected 508
  • Not Extended 509
  • Network Authentication Required 511 

  These are general issues, and if a client starts receiving these errors, they may become frustrated, so you simply receive Internal Server Error or an «Unable to connect to server» error.

  9 High Load to Server 

  When there is a high load on the server due to too many requests then you might get an «Unable to connect to server» generic error.

  Solution: You cannot do anything. Simply try connecting to the server later.

  10 Ports and Socket Blocking

  It is possible that the port used for the server connection has been banned by the administrator of your network or by the internet service provider (ISP).

  Solution: Contact the administrator or ISP about the problem.

  11 Invalid Credentials

  When the server prompts you to provide your login credentials, it is possible that you are using an incorrect set of credentials (username and password or token)

  Solution: Enter credentials correctly.

  12 Network Congestion

  There is a possibility that the network you are using is overloaded, making it challenging for you to establish a connection with the serve

  13 DNS servers misconfigured

  Sometimes misconfigured DNS server can cause the problem.

  The solution you can try is: Set up the right DNS server.

  You can get Preferred DNS Server, to the number 8.8.4.4 and the Alternative DNS server to 8.8.8.8. These are Google Public DNS IP Addresses.

  DNS stands for domain name system, and it is used to load web pages on the internet. When dealing with bad DNS, Google DNS returns accurate results. It also appears to be faster than the default DNS, which speeds up browsing. Google Public DNS is fast, dependable, and performs well.

  14 Software Issue 

  Some software may have an issue with it, and when it requests a resource from the server, due to a software error, it simply displays «Unable to connect to server » with no reason or explanation.

  It’s possible that the software you’re using to connect to the server is either out of date or not compatible with the server itself.

  Solution: If you are using popular software then it will get fixed soon in the next update.
  

  If you are using WordPress and get «Unable to connect to server» without any reason then try reinstalling WordPress Core. Also, check Your Plugins and Themes in WordPress which might cause this problem.

  In the case of games and software that required a login, simply log out and log back in, this might fix the issue.

  15 Games File Issue 

  Some of the game’s files may be corrupted and you may get unable to connect to the server issue because you are not able to connect to the server due to a file issue.

  Solution: Try repairing the files and if possible try to download error games dependent files from the game’s official site.

  16 Incorrect Database and Website/Software Login Credential 

  If your website provides a login page and you have to enter login credentials and when you mistyped username and login then you might get the «Username and password» incorrect or a generic error like «Cannot connect to server»

  If you are using a database and you have used an incorrect userId and password then you might get a Cannot connect to a server error.

  Solution: Try providing current credentials to log in.

  FAQ:

  Lost Ark Games Could Not Connect To Game error 

  Ans: If possible apply above mention fixes, if it does not then you can try the below ways to fix it.

  • Reboot your steaming and the game.
  • Repair Lost Ark Steam game files

  Reboot your steaming and the game. Repair Lost Ark Steam game files Check the following radio button: Under Private network settings: #1 Turn off Windows Defender Firewall (not recommended) Under Public network settings: #2 Turn off Windows Defender Firewall( not recommended)

When I experienced this error in Visual Studio,

“A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 — Could not open a connection to SQL Server)”

…it was during the execution of the following C# code, which was attempting to obtain my SQL Server data to display it in a grid. The break occurred exactly on the line that says connect.Open():

        using (var connect = Connections.mySqlConnection)
        {
            const string query = "SELECT Name, Birthdate, Narrative FROM Friends";
            using (var command = new SqlCommand(query, connect))
            {
                connect.Open();
                using (var dr = command.ExecuteReader())
                {
                    while (dr.Read())
                    {
                        // blah
                    }
                }
            }
        }

It was inexplicable because the SQL query was very simple, I had the right connection string, and the database server was available. I decided to run the actual SQL query manually myself in SQL Management Studio and it ran just fine and yielded several records. But one thing stood out in the query results: there was some improperly encoded HTML text inside a varchar(max) type field within the Friends table (specifically, some encoded comment symbols of the sort <!-- lodged within the «Narrative» column’s data). The suspect data row looked like this:

Name    Birthdate    Narrative
====    =========    ============== 
Fred    21-Oct-79    <!--HTML Comment -->Once upon a time...

Notice the encoded HTML symbol «<«, which stood for a «<» character. Somehow that made its way into the database and my C# code could not pick it up! It failed everytime right at the connect.Open() line! After I manually edited that one row of data in the database table Friends and put in the decoded «<» character instead, everything worked! Here’s what that row should have looked like:

Name    Birthdate    Narrative
====    =========    ============== 
Fred    21-Oct-79    <!--HTML Comment -->Once upon a time...

I edited the one bad row I had by using this simple UPDATE statement below. But if you had several offending rows of encoded HTML, you might need a more elaborate UPDATE statement that uses the REPLACE function:

UPDATE Friends SET Narrative = '<!--HTML Comment -->Once upon a time...' WHERE Narrative LIKE '&lt%'

So, the moral of the story is (at least in my case), sanitize your HTML content before storing it in the database and you won’t get this cryptic SQL Server error in the first place! (Uh, properly sanitizing/decoding your HTML content is the subject of another discussion worthy of a separate StackOverflow search if you need more information!)

sending ICMP ECHO request to 8.8.8.8…

PING 8.8.8.8 (8.8.8.8) 0 (28) bytes of data.

28 bytes from 8.8.8.8: icmp_req=1, ttl=57

28 bytes from 8.8.8.8: icmp_req=2, ttl=57

28 bytes from 8.8.8.8: icmp_req=3, ttl=57

28 bytes from 8.8.8.8: icmp_req=4, ttl=57

28 bytes from 8.8.8.8: icmp_req=5, ttl=57

28 bytes from 8.8.8.8: icmp_req=6, ttl=57

28 bytes from 8.8.8.8: icmp_req=7, ttl=57

28 bytes from 8.8.8.8: icmp_req=8, ttl=57

28 bytes from 8.8.8.8: icmp_req=9, ttl=57

28 bytes from 8.8.8.8: icmp_req=10, ttl=57

— 8.8.8.8 ping statistics —

10 packets transmitted, 10 packets received, 0% packet loss,

0 duplicate(s), time 9007.22 ms.