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Is it possible to ping a server from Javascript?
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Ping is ICMP, but if there is any open TCP port on the remote server it could be achieved like this:
function ping(host, port, pong) {
var started = new Date().getTime();
var http = new XMLHttpRequest();
http.open("GET", "http://" + host + ":" + port, ...
What is IP address '::1'?
...ser question, because it probably means something is broken with your IPv4 TCP/IP stack.
– Joel Coehoorn
Jan 6 '11 at 3:21
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Using port number in Windows host file
...80 is not occupied by another service.
You can check with netstat -a -n -p TCP | grep "LISTENING"
added the following network configuration with netsh command utility
netsh interface portproxy add v4tov4 listenport=80 listenaddress=127.65.43.21 connectport=8081 connectaddress=127.0.0.1
I can no...
Connect to Amazon EC2 file directory using Filezilla and SFTP
...rityGroups -> SSH -> Inbound rules -> Edit -> Add Rule (
SSH|TCP|22|My IP(it's get ip automatically | name for rule) -> Save
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Warning: mysql_connect(): [2002] No such file or directory (trying to connect via unix:///tmp/mysql.
... driver making it use the UNIX socket to connect to MySQL instead of the a TCP socket.
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...以及可以从单个块组成多个块以获得更明确定义的功能的区域。 用户的建议表明，使用更广泛的设备和更多的用户进行进一步测试将更准确地确定蓝牙 LE 组件的兼容性和功能。 这种大规模的可用性测试还将有助于指导如何细化...
Git SSH error: “Connect to host: Bad file number”
...27.239)
Host is up (0.10s latency).
PORT STATE SERVICE
22/tcp ***filtered*** ssh
Nmap done: 1 IP address (1 host up) scanned in 2.63 seconds
As you can see the state is Filtered, which means something is blocking it.
You can solve this by performing an SSH to port 443 (your f...
Application Loader stuck at “Authenticating with the iTunes store” when uploading an iOS app
...kes 15-20 minutes and successfully uploaded to AppStore. But please enable TCP port 443 access.
– Kirti Nikam
Jan 5 '15 at 6:19
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How to enter in a Docker container already running with a new TTY
...tebook.sh" 26 seconds ago Up 25 seconds 0.0.0.0:8989->9999/tcp SLURM_TASK-303337_0
1170fe9e9460 is the container id in this case.
Second, enter the docker :
docker exec -it [container_id] bash
so in the above case:
docker exec -it 1170fe9e9460 bash
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When should TaskCompletionSource be used?
... has the old APM and EAP patterns, but not the awaitable Task methods that TcpListener and TcpClient have.
I personally have several issues with the NetworkStream class and prefer the raw Socket. Being that I also love the async/await pattern, I made an extension class SocketExtender which creates...