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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...sing or wrong in JDBC URL.
DB server is down.
DB server doesn't accept TCP/IP connections.
DB server has run out of connections.
Something in between Java and DB is blocking connections, e.g. a firewall or proxy.
To solve the one or the other, follow the following advices:
...
Can't connect to local MySQL server through socket '/tmp/mysql.sock
...ipe is used.
If host is set to 127.0.0.1, then the client is forced to use TCP/IP.
So, for example, you can check if your database is listening for TCP connections vi netstat -nlp. It seems likely that it IS listening for TCP connections because you say that mysql -h 127.0.0.1 works just fine. To ...
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...
Can you explain the HttpURLConnection connection process?
...as confused before between the 'UrlConnection' instance and the underlying Tcp/Ip/SSL connection, 2 separate concepts. The former is basically synonymous with a single HTTP page request. The latter is something that hopefully will be created once only if you're doing multiple page requests to the s...
Streaming via RTSP or RTP in HTML5
...o over HTTP and only use protocol like RTP? It would be terribly slow over TCP..
– markmnl
Sep 2 '15 at 5:58
7
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What port is a given program using? [closed]
...need more functionality than netstat provides, vasac suggests that you try TCPView.
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How to get default gateway in Mac OSX
...elect your network connection and then click Advanced.
Step 4: Select the TCP/IP tab and find your gateway IP address listed next to Router.
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What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
...etwork interface as you've described but rather binds to all addresses. In TCP stacks this is known as INADDR_ANY – from deleted answer of @strangemonad.
– Piotr Dobrogost
Jan 18 '17 at 13:09
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IPC performance: Named Pipe vs Socket
...ll get with Shared Memory solution.
Named pipes are only 16% better than TCP sockets.
Results are get with IPC benchmarking:
System: Linux (Linux ubuntu 4.4.0 x86_64 i7-6700K 4.00GHz)
Message: 128 bytes
Messages count: 1000000
Pipe benchmark:
Message size: 128
Message count: 1000...
Netty vs Apache MINA
...me functionality. Which one should I choose to develop my high-performance TCP server? What are the pros & cons?
7 Answers
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