I am using Ubuntu 18.04 on GCP Compute Engine.
A simple go lang server listens to port 80 and responds to browser requests.
I was able to connect to the server on the Internet for a day. I stopped the instance couple of times and started. Now port 80 doesn't respond any more and browser times out.
When I start the program, there are no errors reported and my println statement in server faithfully prints a message "listening to port 80".
How can I troubleshoot this problem? Is there a problem with port 80 on Ubuntu?
Also ssh stopped responding. I can only use the web console.
Any help will be appreciated.
Unless you assign your instance a static IP address, your instance has an ephemeral IP address. Stopping your instance releases an ephemeral address. When you start your instance again you are assigned a new address.
The solution is either to use the new IP address or to change the address to be static.
Go to the Google Cloud Console -> Compute Engine.
Make a note of the external IP address.
Go to VPC Network -> External IP addresses.
Locate the IP address assigned to your instance. Under the type column, click on
"Ephermal" and change to "Static".
Related
I am trying to setup a LAMP environment on my laptop with Ubuntu 18.04.
I have no experience real previous experience with this and all tutorials i find are just a step for step guide on how to setup, but none explain what you are exactly doing.
So I don't know why I am having this problem.
After installing all parts of LAMP I can access localhost, and I see the apache default page.
But if I try to go to my IPaddress, (the ipaddress I found with curl -4 icanhazip.com) the page loads for a while and then tells me this:
Firefox can’t establish a connection to the server at 213.127.26.xxx
So my question is am I using the right IPaddress and how can I make apache work from my IPaddress? Because phpmyadmin will not work on localhost.
The issue is likely that your local ports (i imagine your web server is running on port 80 or 8080) are not being forwarded through your router. Your router likely uses something called “NAT (network address translation)” to expose all of the internal IP addresses on your network through a single “public” IP address, in your case 213.x.x.x (you should never post this here unless you’re 100% positive your network is secure!). Your router needs to be configured to forward port 80 on 213.x.x.x to your machine’s “internal” ip address, likely something like “192.168.x.x” or “10.0.x.x”. A search for “port forwarding ” should help you out
Alternatively, ngrok is a nice free tool which you can use to expose your port on a public address. By running nginx http 80, it will provide you with a temporary url where you can reach your site (on a free plan, it will only provide you that url for one day, so you will need to re-run it)
First, you have to find out on which ports your server is running.
After that, you have to go into your router's settings and add port forwarding entries for these ports, to make sure that your router forwards the requests to the right device.
It has been a while since I started using wampserver online, and until now it all went fine, but I recently started having a problem: I can access the server through a local ip (192.168.1.37 | 127.0.0.1 | localhost) if connected to my router or from my router's ip (e.g. 83.85.44.55) if im NOT connected to my router.
So basicaly if I'm connected to my router and try to access the servel with my router's external ip, I get a timeout error, whereas if someone from for example India tried to connect he would be able to do so.
I'm currently using wampserver 2.5 for windows with apache 2.4.9 and have already re-installed everything.
Thanx in advance.
Elemermelada -
Port forwarding can be tricky when you are trying to access the server from multiple networks (i.e. your internal network and somewhere else on the internet). You are able to access the server with it's local IP because you are on the same subnet and there is no routing being done. When you attempt to connect to your webserver with your router's IP address, you are never making it to the webserver, regardless of the NAT/Port forwarding in place. The traffic is being dropped by your router because you are trying to access it from the inside. Unless you have a router that can be configured in a certain way, you will always need to connect to your webserver by it's local IP address when you are on it's local network.
I've set up an Ubuntu Web Server to host a game that uses port 25565.
I've set the router to port forward that port to the web server and gave the web server a static local IP. I've done this before using my own PC as the server.
When I try accessing the web server on that port using it's local IP I have no problem at all.
But, when I try accessing it from outside the network, I can't connect.
I've opened my router's list of DHCP clients and the web server is only listed there sometimes without a pattern I've been able to see.
Why I think the error is at my router:
I've installed Wireshark on the server to see if Apache was somehow blocking the web packets upon arrival. I tried opening all ports and I tried opening port 10000 which webmin uses (I'm able to connect to it locally). Neither has been successful.
Although I'm not experienced in the field, I don't think the packets get to Apache.
Please assist. Thank you!
Does your router hold the external IP address, or an internal one?
If it holds a private IP like 192.168.x.x, 10.x.x.x, or 172.16.x.x, then you would need to setup port forwarding on whatever device your router is connected to.
I've managed to fix it by changing the web interface of the port forwarding from atm1.1 to ppp1.1. It was just luck, as I understood it's web protocols but I don't know why it worked.
Thanks everyone for the help!
I have created a web application in glassfish and I can access it on my LAN.
How can I access the web application from a remote location over internet?
I do not have static IP.
Please reply.
Thanks.
Steps :
Creating virtual DNS(Domain name server) Server on your machine.
Port Forwarding.
Reference https://cookbook.fortinet.com/port-forwarding-60/
Remote Desktop Connection enabling.
Creating Inbound Rules. Reference :
https://www.howtogeek.com/112564/how-to-create-advanced-firewall-rules-in-the-windows-firewall/
Creating account on www.noip.com and create custom host and download DUC (Dynamic Update Client) Software.
Some more steps may have it depends on your LAN Router and firewall configuration.Use http://ifconfig.me/ to get your public ip.
Access from outside your machine should be configured by default. You may check if it is so in admin console, at Configurations->server-config->Network config->Listenters. There should be one listening on the desired port (like 8080) and be bound to 0.0.0.0 address.
To easily access something behind a dynamic ip you need something like http://www.noip.com/ or http://www.dnsomatic.com/ (I took these from my router's control panel)
I did this recently,
first you need to use port forwarding on your router, access it by typing your default gateway path, mine was 192.168.0.1 then go to "advanced settings -> Port forwarding". Simply enter the details that are asked for, I set mine to HTTP using port 8080, yours might be different. Protocol is TCP. The IP address it asks for is your local address.
For quick testing you can disable the firewall on your machine and then you can search on google for your Public IP address by typing "what is my IP".
Then type your ip into the browser and the port number "ipAddress:portNumber"
You should see the glassfish welcome screen if it is successful.
After that you might want to enable your firewall again but then you have to add an inbound rules to allow the port to be used:
Setting Windows inbound rules
Then you still have one last step to perform, allowing glassfish to access the resources on your machine: Adding glassfish to allowed programs
Follow the instructions on adding java.exe only.
I am able to connect it if the two devices are in the same network but for example, if I use 4G on my android and turn of the wifi and try to connect to http://computer-ip-address then it just hangs and eventually errors out saying count not connect. The apache server is hosted in my local mac, and I've disabled my firewall temporarily. Any ideas on how to get a device using a different network to connect to my apache server on my local network?
You will need to configure your router so that it will forward port 80 from external to your mac.
Then, you can open http://your-public-Internet-ip on your mobile phone, effectively visiting your local web server.
If you don't like to remember your ip address, especially if you are on the go, the answer is dyndns or any free alternative, e.g. http://www.no-ip.com/services/managed_dns/free_dynamic_dns.html.
Using such a service, you will be able to enter http://yourname.service.com into your mobile phone. You will either have to configure your router to always tell this service your current IP (check your router for supported services) or run a tiny program on your mac which will handle this.
You need to enable port forwarding on your router to forward TCP 80 (and possibly TCP 443 if you are using SSL) to your web servers IP address.
Once done, you should be able to access your site via your routers public IP address.
Take note that of your web server is using a dynamic address provided by DHCP, your IP may change and this would stop it from working. I suggest you give your web server a static IP address to stop this.
You will probably have a dynamic IP on your router as well, so you can request a static one from your ISP or you can sign up for a dynamic DNS service.
If you post the model of your router, we may be able to give you more specific instruction on setting up port forwarding.
i hope your httpd.conf is set with port listening to
Listen 80
also, you can only access your site from your LAN otherwise, your server would need to be reachable from a public IP address, not a private one over an internet 4g connection, that means a diferent network
bonus points, if you try to reach your server from an external address, did you configure portforwarding on your router ?
If you could immediately and immediately connect to your localhost using your 4G network, then most likely anyone on the internet could do the same. It is important to understand that there are two components to the answer to your question:
Securing HTTP access (port 80 or whichever) from the internet. You probably don't want to open a wide door to your local network.
Configuring addressing from your client (in this case your phone) to your local computer (in this case your Mac). If the latter does not have a public IP address, then you will have to configure your client to hit your router instead, and to configure your router to forward accordingly.
Given that this is mostly system configuration work, I'm guessing that Serverfault would be a better place to find a satisfying answer.