While working on a project, I've observed that, if a open a single Chrome tab, there are multiple socket connections being made. Ideally I assumed, there should be only one connection, that is from my local machine to the google server.
Here is the netstat results of multiple remote connections made:
Why are there many connections made instead of one? Please clear this doubt for me, thanks.
Because when you open a Chrome tab, it will load not only one resources from the internet(maybe not just from Google). You can use some HTTP/S request capture tools like fiddler or HTTP Analyzer to see those requests.
Related
I have a Windows 2016 Server with IIS 10.0.14393.0 installed that is maintained within an isolated VM environment. (The entire VM environment is isolated from the real-world.)
The web server is configured with three websites through IIS, and each website is assigned a dedicated IP. The contents in each of these websites is a single "hello world" html page that can be accessed via a browser from from my development workstation using Microsoft Edge, but I cannot access these pages using Chrome. The simple hello world html page was created only to assist in troubleshooting this issue.
The error received in Chrome is ERR_TIMED_OUT and based on the IIS logs, the request is never reaching the web server. IIS logs do indicate the request/reponse when accessing using Edge.
From my workstation, I can successfully ping the web server, traceroute output does not indicate any unexpected hops, etc. From all indications, the problem appears to be isolated to Chrome and only when accessing the sites on that server. I have other servers (W2016 and W2019) in the real-world with a similar configurations and real applications deployed there that work as expected with any browser.
I am using the latest Chrome Version 105.0.5195.102 (Official Build) (64-bit) and can access other web based content within this VM environment using Chrome, just not on that one server.
I am almost to the point of deleting that VM instance and starting over so any ideas/suggestions are appreciated.
The error received in Chrome is ERR_TIMED_OUT
This is a communication problem indication that there is a problem with the user's local network connection. It can appear when your internet is too slow or your connection is taking too long, or the page or website you are visiting may be too busy, or when the website in question is not set up correctly, or even if the website is trying to perform more than your server can manage.
I'm not sure if you've seen the following methods, but you can try.
Method 1: Browse in Incognito Mode and Remove Extensions.
You should first browse the website in incognito mode to check if you
can open the website normally, if so then the culprit of the
ERR_TIMED_OUT error may be your plugin or extension. Therefore, you
need to enable extensions one by one to check for errors, and if there
is an error enabling an extension, you need to remove it from your
browser.
Method 2: Delete the Default Chrome Folder
Press Win + R keys at the same time to open the Run
Type %LOCALAPPDATA%\Google\Chrome\User Data\ in the box and click OK.
Close your Chrome if it is opened.
A new window pops out, find the folder named Default. Backup the folder anywhere else, then right-click the folder to choose Delete.
After you have deleted the folder successfully, open your Chrome and
then visit the webpage again that you searched before to check if the
error still appears.
Method 3: Update Network Drivers
If your network driver is out of date, you may encounter ERR_TIMED_OUT
errors. Here's how to update network drivers.
Right-click the Start button to select Device Manager.
Scroll down to find Network Adapters and click on it to expand it.
Right-click on your network device and select Update Driver.
Select Search automatically for updated driver software option to start to search and update your network driver to a new version.
After that, restart your computer and open the sites again with Chrome
to see if you can open them.
Method 4: Disable Firewall & Antivirus Software
Sometimes, your firewall or antivirus software may cause trouble.
Therefore, you should try to disable them and check if the problem can
be solved. If you find it helpful to disable these programs, you can
check the firewall settings. Allow Chrome to connect to public or
private networks. If it doesn't work. Permanently delete these
programs, and then use other antivirus software or firewalls.
Method 5: Check Hosts File
When you meet the ERR_TIMED_OUT error accessing a specific website,
you can check the Hosts file to see if the website has been blocked.
Here is the way to do that:
Press Win + E keys at the same time to open File Explorer and then go to the Local Disk C: > Windows > System32 > Drivers > etc.
Open the host file with notepad. If you see the web address that you cannot visit, delete that entire line from the host file and save.
After that, open the Chrome and see if you can open the specific
website.
Method 6: Reinstall Chrome Browser
If none of the methods above fix the ERR_TIMED_OUT error, then you
should try reinstalling Chrome. Here is the tutorial:
Press Win + R keys at the same time to open the Run box, then type appwiz.cpl and click OK to open a new window.
Find Google Chrome in the list, and then right-click it to choose Uninstall.
After uninstalling Google Chrome successfully, you also need to delete its leftover files. Open the Run box again, then type %appdata%
and click OK to open a new window.
Find the Google folder and then right-click it to choose Delete.
Go to Google Chrome’s site to download the latest version of the browser, and then install it.
The above methods are from the web article. To avoid link being unavailable, I have also presented the details. I am not sure if the above methods can help you, but I hope you can solve the problem soon.
I have used a method for years that has worked for me and limited any mysterious domain-based issues with cookies and such.
In my /etc/hosts file, I do the following for the local development version of www.mysite.com:
127.0.0.1 localhost local.mysite.com
When I visit http://local.mysite.com:3000, this has done exactly what you'd expect for years and years, and still works in Safari and Firefox. However, Chrome started stubbornly giving me an ERR_CONNECTION_REFUSED message a few months ago, and I can't make it work. If I visit http://localhost:3000, it works fine, but I avoid developing against localhost for various reaions. I have tried every possible thing I can find on the internet (clearing caches etc), and nothing has made the error go away.
Anyone have any idea what can be done here?
In the browser, please clear host cache and then try it out. To clear host cache, follow the steps below
Open up Chrome browser and enter " chrome://net-internals/#dns " in the address bar without quotes
Click on the button Clear host cache
Restart your browser and try again
You need to disable the dns prefetching and network condition predicting services on chrome.
As chrome is trying to look for local.mysite.com in actual dns servers and not finding the local ip address.
You can see the below steps -
Go to chrome://settings
Click on "Show advanced settings..."
Unmark the Predict network actions to improve page load performance
box.
Check if the DNS prefetching is really disabled by going to
chrome://dns.
You should see there something like DNS pre-resolution and TCP
pre-connection is disabled.
Normal js code (no service worker, but the app has a manifest with an empty service worker).
A simple timeout to an ajax call that's the code.
I close all chrome tabs, I close the process in task manager, no more chrome processes and yet I still get requests on my server. This happens locally and on the server, I know this because I can see the cookies sent and for which user id is needed.
Also I know that chrome is running the code because there is a date in the request and is updated as it go.
Triple checked that chrome is closed on all users and all processed in task manager.
Is not a coincidence because at this moment I have 2 different users (different chrome profiles) doing this. Also in my dev server there are a lot of users with the same behaviour.
I'm also not sure is chrome, but has to be, node.js alone can't change the time of the request.
Win 10 and Chrome Version 60.0.3112.90 (Official Build) (64-bit)
Terrible and I don't know what to do...
if I restart my node.js server all the requests stops.
Was my mistake! As I have server side rendering (with react) I forgot that the timeout was also run on the server side. The fix was to don't run any timeouts on the server side.
Thanks anyway for the answers. I was concerned how chrome was still running my js code even shut down, made no sense at all!
We load data from a few subdomains/3rd parties. This causes about 100ms of SSL handshaking for each domain. I'm wondering if there is a way to "pre-fetch-handshake" similar to how dns-prefetching works. Does dns-prefetching already do this?
I doubt that there is a pre-fetch-handshake and I doubt that it would make sense. DNS prefetching is done for links in the page so that the browser already knows the IP address of the target host when the user decides to click the link. This might be immediately after loading the page, some minutes later, hours later or never. DNS prefetching also does not tie any resources on the server. It just warms up the local DNS cache by asking the upstream DNS resolver which might either have the record already or will resolve the query and thus have the entry in the cache, available for other clients too.
Contrary to this a pre-fetch-handshake for HTTPS would need to create a TCP connection directly to the target server, do the SSL handshake and then wait for the client to click. This ties up resources at the client and the server so after some time of inactivity the server will close the connection to free these resources. Thus in many cases this would just waste resources on both sides since the link will never be clicked or will only be clicked after the server already closed the idle connection.
The situation is a bit different if the link points to a site with an already existing connection, like a same-site link when loading a page from some site. Today browsers use persistent HTTP connections and will try to leave the connection to a site open for a while in case more requests need to be send. If the user then clicks the same-site link an existing connection might be used which was still open from previous requests. Of course these connections tie up resources on the server too so the server will close the connection after some idle time too.
Is there any way to disable web socket connections or end a web socket connection through Chrome's developer tools network tab?
I've noticed that turning throttling under the network tab to Offline doesn't affect web socket connections that have already been established. It only prevents traditional HTTP requests from going out.
There's a question here related to this, but it's woefully outdated.
February 2022 update
As of Chrome 99 this is supported: https://developer.chrome.com/blog/new-in-devtools-99/#websocket
Original answer
No, there is no way to disable or close a connection from the Network panel. Source: DevTools Engineer.
If you have a reference to the WS connection, though, you can close it via the Console using its JS API.
You can close idle and flush your inactive socket pools in the Net Internals page in Chrome. However, this unfortunately only closes your active sockets by the looks of it.
chrome://net-internals/#sockets
You would have to use the WebSockets API and call close() on a reference to an existing socket to close it explicitly. Otherwise, killing the process with the active socket is all I can think of.
I assume you want to test unexpected connection failures, it is possible, but not through Network-tab and you need to be able to log from code.
You can close Websocket connections if you are able to use console.dir(socket) even when you could not store the connection reference, e.g. due sandboxing. Via console.dir() you are able to gain a reference to the socket by right clicking the console.dir() output of the websocket and choosing "Store object as global variable". Then call close() on the temporary reference and the connection you want to terminate closes.