Very new to the Self Host WebApi, but I am very impressed with its ease of use and extendability. At least through this tutorial. Everything I've done so far works on my development machine whether I use localhost, 127.0.0.1, or my LAN Ip (192.168.0.x) but I am baffled why I can't access the service from any other computer even others in the same subnet.
In short after going through the tutorial on the machine where it is running:
Browsing to
localhost:3636/api/products/
results in the expected xml return.
On another machine on the LAN browsing to:
192.168.0.x:3636/api/products/
results in a timeout
Data points for those who might know how this all interacts:
1.) My dev machine(192.168.0.x, server, host whatever you want to call it) has IIS on it; I was so paranoid it was in the way that I stopped it via the Administration GUI
2.) I have reserved the URL/Port with the following command line executions:
>netsh http add urlacl url=http://+:3636/ user=DOMAIN\USER listen=yes delegate=yes
>netsh http add urlacl url=http://192.168.0.x:3636/ user=DOMAIN\USER listen=yes delegate=yes
2.b) I've tried both of those together and individually, and tried changing the user to "everyone" to no avail
3.) I have tried to change the code in the tutorial to set the
config.HostNameComparisonMode = HostNameComparisonMode.Exact //default is Strong Wildcard
4.) I can successfully ping and tracert to 192.168.0.x from other machines on the LAN
5.) A friend recommended I setup a TCPListener and ensure I could telnet to that to eliminate the firewall as a possibility. If that logic is sound, the firewall isn't the problem
EDIT: Thanks for your help, here's another data point that I believe confirms it's not a firewall issue. I previously posted this connection when behind a rather obtuse (at least to a non Certified guy like me) Juniper Firewall/Router. I have since redone the tutorial on another machine (without IIS) on my home network and still cannot publish the service to other computers within my LAN. Any ideas?
Well it wasn't the hardware firewall, it was the windows firewall! yikes i wasted a bunch of time on that. Once I turned off the windows firewall (the code runs in an intranet anyway) everything worked.
Anyone know of a good site that explains how firewalls and wireshark interact; or i suppose that just has to be one's first test.
I would try a couple things:
First off, get rid of the HostNameComparisonMode line. That might actually disable requests coming from other machines.
If things still don't work, try getting rid of the URL ACLs and run your application as an administrator and see if that works. If that works, you may be able to add the URL ACL back on and not have to run as an administrator. You should only need the one with '+' as the hostname.
I faced the same problem when i tried to self host using OWIN. What worked for me was -
Run Visual Studio as an Admin
Remove any and all netsh urlacl port registrations that I had added while debugging this issue
Add a inbound rule to my windows firewall
I followed the instructions on this link
https://learn.microsoft.com/en-us/dotnet/framework/wcf/samples/firewall-instructions
Check out the section - To enable a port range in advance
That's it! I was able to call my api from other computers on the network.
Hope this helps...
Related
This morning I noticed that none of the web apps I am running in Azure is reachable anymore.
I first thought its an issue with Azure itself, but when I try to connect with a mobile hotspot (through my phone) everything works as expected.
The problem seems only to exist in my own LAN at home but only Azure is affected.
When I try to navigate to a website, I get the following message:
I also cannot nslookup it:
I do not have any problem with surfing the internet. All other sites work fine... but I don't even know where to start on solving this problem.
Does anybody know a tool to diagnose this? What could be wrong here...?
I did not have any issues with accessing the services yesterday.
In recent years, DNS has become the most vulnerable part of the internet, as many other components are strengthened significantly.
Like you discovered, for some unknown reasons the DNS your machine connects to failed to sync the proper Azure related records. That's not an uncommon issue if you read about how badly DNS infrastructure around the globe was maintained.
Usual solutions are,
Switch to other DNS service than your default ISP provided ones, Google/Cloudflare public DNS servers are popular, and there are many other good options.
Hack your hosts file (but that's too complicated).
Since you had no Problems yesterday, my first question is: Did you change anything in your local Network?
Maybe some new Firewall rules or maybe some entry in your Host File for testing?
When you try to access Azure with only the IP, does that work? If yes then you have to look at your DNS.(maybe try Google DNS 8.8.8.8)
I am a newbie at PowerShell but wouldn't ask without spending a ton of time looking online first.
Is there any possible way of specifying ipv4 DNS Server (and alternate) without being connected to the VPN first?
I am installing VPN profile for a business which I can do manually but there is close to 180 users which I am trying to implement through a PowerShell script in Endpoint Configuration Manager. I am obviously trying to work smarter, not harder.
I already have the Add-VpnConnection script down which works great but I still have to manually change the Primary and Alternate DNS for ipv4.
In addition, I would like to turn off ipv6 for this VPN but that coincides with this originally problem I am running across.
Any help or ideas down the right path would be much appreciated!
I am using Putty to ssh into some of the servers that I work on. I am able to connect all others except the one. Although I was able to connect to it before. Whenever I try connecting to it, it always give me error:
Unable to open connection on myhost: Host does not exist
My firewall is off and I have even re-installed putty but that did not fix it. When I tried connecting to the same server using putty on some other windows system, I was able to do so. I searched regarding this on Internet but did not find much relevant.
I am running putty on Windows 7.
What can be the possible issue?
As I understand you have three computers involved. At the same time one connection is working and the other one fails. So we can exclude that the ssh daemon on your linux box is hanging.
In lack of knowing their real names I will call your computers linuxbox (this is the computer you want to ssh into), win7ok (that is the computer that you are able to ssh from using putty) and win7fail (that obviously is the computer you can't connect from).
Please do a tracert from both Win7 computers:
tracert linuxbox.your.domain
tracert linuxbox
Add the results to your question as it will help us find out what is happening.
Perhaps it is also a good idea to determine the ip address of the linuxbox from win7ok:
ping linuxbox
or
nslookup linuxbox
Then try to connect from win7fail by using the ip address of the target computer, perhaps it is only a DNS problem (which might be as nmap is failing too).
To make all of this easier to understand for us please provide the real names of the computers as you use them in putty.
For me the problem was with the Url of the reposity. Check remote URL. It must start with git#github.com, not https://.
I used nslookup and then used the ip address it gave me to connect and it worked
I had a similar problem with GitExtensions. The solution was to remove the https url and replace it with git#gitlab....
WRONG:
GOOD:
I just went through this. I have a Cisco VPN I need to use to get through to the Linux machine I wanted to login to and check.
No Putty session would get through using the machines name.
An nslookup on the windows machine yielded the correct address.
I too connected right in via the ip address.
I tried to Google the error and it failed, so I suspected the wireless.
Disconnected and reconnected my WiFi and all was good.
I did it fast enough that open connections stayed open.
And new connections refering to DNS names worked fine.
Seems like maybe some cached DNS addresses were stale.
Your DNS cache stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you can no longer access the site.
Following CLI command will do the trick:
ipconfig /flushdns
I wanted to set up a simple go server in a webhost. I acquired a domain mydomain.com and hosted it using Bluehost. Now, going through the Go tutorial, I went through this example http://tour.golang.org/#59 and it works fine on my machine. Now, instead, I want to make the HelloWorldServer work when I call mydomain.com:4000 or some other port.
What I did was ssh to my server at bluehost, install go there, then compile the server and run. But then I try to access mydomain.com:4000 and it is not found. I also tried to change "localhost:4000" to just ":4000". any ideas how to make it work ?
Any help or pointers are appreciated. (some more details: it is a shared-hosting account)
This is due to the firewall on your BlueHost server not having ports (including 4000) open on a shared hosting account, Firewall Port Restrictions
If you want to do some simple (and not so simple) web hosting, why don't you look at Google App Engine
I have a strange problem, I just installed my php web site on a shared hosting, all services were working fine. But after configuring my app I just could visit my web site only once, other attempts gives:
"The server is taking too long to respond.".
But from other IP i can access, but only once, it seems all ip addressess beeing blocked after first visit(even ftp and other services get down, no access at all from the IP), can anyone help to explore this problem ? I don't think that it's my app problem, the app works fine on my local PC.
Thanks.
First thing to try would be a traceroute to determine where your traffic is being blocked.
In a windows command prompt:
tracert www.yoursharedhostingserver.com
At the moment, trying to access this address gives this:
Fatal error: Class 'mainController'
not found in
/home/myicms/public_html/core/application/crApplication.class.php
on line 181
I have tried it multiple times and it didn't block me. It might be that You have already solved this problem.
As far as I know, the behavior described by You could only be explained by a badly configured intelligent firewall. It may have been misconfigured by Your host.
If You visit a site at a certain host and suddenly You cannot access an ftp on this host, then it's either a (really bad) firewall or a (very mean) site that explicitly adds a firewall rule to ignore that address.
Some things that You might look into:
It might be something with identd too. What was the service You have configured on Your host? Was it by any chance any kind of server-controll panel (that might have an ability to controll a firewall)?
Is the blockade permanent, or does it go off after 24h, or does it only go off after rebooting the server? Does restarting some services makes the blockade go off?
Did You install any software that "protects Your server from portscanning"? It might be a bit too aggressive.
I wish You good luck in finding a source of this problem!
Chances are that if you can access it once that its actually working. The problem is more than likely in the php code than in the server.