If I disable CORS configuration in the API gateway, the OPTIONS request also fails due to CORS issue. If I add CORS configuration in the API Gateway, The OPTION request returns 204 with propper cors headers, but POST request does not return proper headers. I have mapped API gateway with the following configuration:ĪNY / mappes to the public domain of the ec2 instance on port 8080 envoy/envoy.yml:/etc/envoy/envoy.yaml:ro Here is my docker-compose.yml version: '3.8' name: /.http_connection_manager.v3.HttpConnectionManagerĪllow_methods: GET, PUT, DELETE, POST, OPTIONSĪllow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,custom-header-1,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout I want to add JWT authentication that's why I want to expose the API via API-Gateway. But when I try to access it via the invocation URL of API Gateway I get a CORS error. I'm able to use the service directly via the public IP of the ec2 instance. The solution to this problem is that connect to the same end point your server is listening on.I have a backend service that I want to expose via grpc-web. So your client is trying to connect to any of the non-loopback addresses of your machine, while your server is listening only on the loopback address. This includes the public and local IP addresses of your machine (e.g. When you pass a host name to TcpClient, it will resolve it to one or more IP addresses using Dns.GetHostAddresses(hostName). ĭns.GetHostEntry(IPAddress.Loopback).HostName returns the host name of your machine. It allows the computer to communicate with itself via network protocol. This exception message says you're trying to connect to the same host ( 127.0.0.1 ), while you're stating that your server is running on a different host. The target machine actively refused it 127.0.0.1:xxx There are various architecture choices you can explore that mitigate queuing up sockets and processing them sequentially. If you wrote the server, you might have heavy processing in the accept of your client requests, and it is better moved to a separate worker-thread so your accept is always ready to receive more connection requests. Regardless of whether you can increase the server backlog, you do need retry logic in your client code, sometimes it cope with this issue as even with a long backlog the server might be receiving lots of other requests on that port at that time. If it happens occasionally, it is likely because the server has a full 'backlog'. n : Numerical display of addresses and port numbers b : Displays the executable file of a connection or listening port (requires administrator rights) In Windows operating systems, you can use the netstat services via the command line (cmd.exe). On Linux you may need to do netstat -anp instead.If you get nothing, try changing your port number and see if that works for you. If none of the above work, try running netstat -anb from the command line to see if there's anything listening on the port you were entered. There is a security program on your PC, i.e a Internet Security or Antivirus that blocks several ports on your PC.You can enable the program to go through firewall in the Inbound list. The server is running but that port is blocked by Windows Firewall or other firewall.If it's a service you may want to restart the service. There are some other possible reasons for this error is that: config files, mostly this error is caused by a wrong port number you assigned, or incorrect name of the PC (which should be localhost if you are testing everything in one PC). Disable proxy at web.config fileĪlso, check your. It is not possible to activate Port-Forwarding. The easiest way to check would be to disable your firewall or proxy and try again. Connecting the Router to the EMnify platform with our IoT multi-SIM Insert the SIM card into the router. You might have a firewall rule in the way, or are trying to run it through a proxy without having the proxy up and running. This may be because it is not running at all or because it is listening on a different port. Either there is a firewall blocking the connection or the process that is hosting the service is not listening on that specific port. Generally, it happens that something is preventing a connection to the port or hostname. Most of the connection configuration is inherited from the connection being joined. An object representing the connection parameter name/value pairs to apply to the connection, as documented in Configuring connections. It literally means that the machine exists but that it has no services listening on the specified port. The opaque ID given within the id property of the connection being joined (shared / shadowed). It means that the error is occurring because there is no server listening at the hostname and port you assigned. This error is a network-related error occurred while establishing a connection to the Server. No connection could be made because the target machine actively refused it
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