Can't access my websites from my IP in different operating systems

Question

I use my internet connection via a typically installed Win10 home / Apple Iphone (iOS) with different browsers. The operating systems and browsers are all up to date.

I host two WordPress websites on a CentOS shared-server environment at siteground.com.

My problem

When surfing from my IP I get the error "site can’t be reached", from all browsers. It doesn't matter if it's WIFI or Ethernet, I'm still having the above problem.

The sites work fine and are fully accessible from other IP addresses though (for example, if I change my WIFI to a free WIFI found by my PC, I can access the sites).

Debug tries

After using Windows troubleshooting tool in Chrome after navigating to a relevant domains, I got this error:

Windows Could not Automatically Detect Network’s Proxy Settings.

Powershell

ping TARGET_DOMAIN brings:

Reply from TARGET_IP: bytes=32 time=189ms TTL=53

tracert TARGET_DOMAIN brings:

Unable to resolve target system name TARGET_DOMAIN.

Also, nslookup TARGET_DOMAIN brings:

nslookup : *** Request to Broadcom.Home timed-out At line:1 char:1
+ nslookup TARGET_DOMAIN
+ ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (*** Request to Broadcom.Home timed-out:String) [], RemoteException

Solution tries

Flushing my local DNS cache in Powershell with ipconfig /flushdns, then flushing my browser's cache, doesn't help (not even after turning off WPAD).

Further details

I didn't touch the Windows HOSTS file.
As of the moment, and just for testing, no security plugin (like WordFence or Loginizer) is installed on any website so the problem shouldn't come from WordPress.
The hosting company couldn't track any problem in the server environment; a talented sysadmin of their team, told me that the problem is of my end.

My question

What may be the problem?

score 3 · Accepted Answer · answered Jun 26 '18 at 20:59

Since you are getting these problems only when trying to access this website while using the ISP, the problem is not with your computers or phones.

The problem has to be with your ISP, either his router or his DNS server. It might even be that the ISP has erroneously flagged this website as serving malware and is blocking it actively. The three steps below will help you diagnose whether this is indeed the case and will help find a workaround.

Step 1 : Use the Google DNS servers for your PC

The first step is to use your ISP but bypass his DNS server. You do that by setting your DNS server to Google Public DNS, whose addresses are 8.8.8.8 and 8.8.4.4. Note down the previous DNS settings as before the change. The following Google article describes the method in the section Change your DNS servers settings.

If this works, then to apply it to all your devices continue to the following Step 2, but skip Step 3. If it does not work, go directly to Step 3.

Step 2 : Set your router to use the Google DNS servers

Login to your router and access the DNS page by clicking on the Advanced menu link at the top, and then click the DNS menu link on the left.

Assuming your router is connected by cable, select Use the following Static DNS IP address and enter 8.8.8.8 in the first box and 8.8.4.4 in the second. Terminate by clicking Apply/Save.

Test accessing the problem website from another computer/phone, and if it works then undo the changes you did to your computer in Step 1 as they are no longer required, and don't go to Step 3.

Step 3 : Connect your PC via VPN

Here we test if your ISP is actively blocking the website. To do that we will go through a free VPN service that your ISP cannot block. Leave your computer set to the Google DNS servers, then choose any free VPN service that you like from the list in the article Best Free VPN which also contains reviews. Choose one that has good information of how to use it, or ask here for help.

If this works, then your ISP is blocking that website and you should complain loudly. You may need to convince them that this website is legitimate. You can continue using the VPN as a workaround, if its performance is good enough, or find a commercial one.

The only good solution if your ISP does not fix the problem, is to change the ISP, that is if this website is important to you and you use it a lot.

score 1 · Answer 2 · edited Jun 26 '18 at 14:27

1

I had a similar problem to where it took a long time for browsers to connect after the cache was flushed.

You might need to disable Web Proxy Auto-Discovery Protocol (WPAD).

This could be done simply this way:

Settings > Network & Internet > Proxy and switch Automatically detect settings to Off.

edited Jun 26 '18 at 14:27

answered Jun 24 '18 at 13:11

sloshnmosh

81

score 0 · Answer 3 · answered Jun 26 '18 at 16:50

It seems that the issue is your home router based upon the “nslookup” response.

For troubleshooting I’d firsty try to see if you can ping the IP address of the web server in command prompt, followed by trying to ping the domain name of the website.

If you get a reply from pinging the IP and not the domain name it is likely the issue is DNS related (which is what im assuming from the nslookup results)

If that is the case I’d suggest using “ipconfig /all” in command prompt to establish what name servers your device is using. (Once again I’m assuming it is likely to use a local address that is associated to your router)

If that is the case change your network adapters settings whether its the wired or wireless one and manually change your DNS settings to use googles DNS servers 8.8.8.8 and 8.8.4.4.

This should help if you get stuck: https://www.windowscentral.com/how-change-your-pcs-dns-settings-windows-10

If that resolves the issue I’d suggest logging on to your router and changing the routers DNS servers to Google’s as well.

Fingers Crossed for you!

undrline - Reinstate Monica · Answer 4 · 2018-06-26T18:23:28.530

If I understand the issue correctly:

You're trying to connect to your site on a remote server hosted by someone else

You've tried the following combinations:

Windows 10, on your network, multiple browsers = fail
iPhone, on your network, multiple browsers = fail
Windows 10, on unsecured neighbor network, any browser = success
iPhone, on unsecured neighbor network, any browser = success

In the failed environments, you've tried flushing DNS to no avail

At one point, it seemed to work, for one site, when you were able to get the Windows Network troubleshooter to assist with your supposed proxy settings

So, you've already ruled out the site, browser, and device:

that the site is down
that your browsers have a page caching issue
that your devices have a dns cache issue
that your browsers have a settings issue

What's left

Really, the only thing that's left is your network. So, there's your ISP, your modem, your router, your device.

I presume that, connected to your network, you can see other pages, but you should double check. After all, the first line in the troubleshooting guide is to make sure that it's plugged in :)
Exclude your router and see if it works. I know it's probably a PITA, but set up a wired connection directly to your modem. Even if you have a wifi-enabled modem, this still excludes possible wifi issues.
- If it works, then you can blame your router/wifi: this becomes a "it's your fault, you gotta fix it" problem. Try connecting directly to your router since you've got the cord out.
  - If it still works, it's something to do with your wifi configuration.
  - Whether it works or not, it's easiest to just factory reset your router and change one setting at a time back the way it was before, until you find the culprit. Do yourself a favor and take some screenshots before you do the reset. A pin reset works better than one from the router's page for many devices for some reason.
- If it still doesn't work, something's going on with your ISP: they'll make you restart your modem every which way, and maybe try putting your modem back to factory settings.

score 0 · Answer 5 · answered Jun 30 '18 at 17:05

There are multiple ways you can do it.

There can be DNS issue. Either use Google Public DNS or CloudFlare DNS. This will more likely to resolve your issue.

But If problem still exists:

Go to https://whatismyip.live and copy your IP address and see if your IP is blocked by your server or hosting company. Give your IP to your hosting company or server company so that they can investigate any issue from their side.