connection

问题 I'm making program in Java, which connects to MySQL database. As first class was class with single static method returning java.sql.Connection . After it was debugged and connection was working I never touch it again. And few days ago I discovered my program was returning this error: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception BEGIN NESTED EXCEPTION com.mysql.jdbc.CommunicationsException MESSAGE: Communication link failure due to underlying

问题 I've made a simple test application for reading RabbitMQ queues using java amqp lib ( implementation 'com.rabbitmq:amqp-client:5.7.1' ). But im having trouble when connectiong to my rabbit server due to Android permissions (socket) Here is the error message: W/System.err: java.net.SocketException: socket failed: EPERM (Operation not permitted) I've tried, successless, to add android.permission.INTERNET to the manifest. Here is what it looks like: <?xml version="1.0" encoding="utf-8"?>

问题 I am trying to test a simple WCF tcp.net client/server app. The WCF service is being hosted on Windows 7 IIS. I have enabled TCP.net in IIS. I granted liberal security privileges to service app by configuring an app pool with admin rights and set the IIS service application to run in the context. I enabled tracing on the service app to troubleshoot. Whenever I run a simple method call against the service from the WCF client app, I get the following exception: "Stream Security is required at

问题 I am trying to test a simple WCF tcp.net client/server app. The WCF service is being hosted on Windows 7 IIS. I have enabled TCP.net in IIS. I granted liberal security privileges to service app by configuring an app pool with admin rights and set the IIS service application to run in the context. I enabled tracing on the service app to troubleshoot. Whenever I run a simple method call against the service from the WCF client app, I get the following exception: "Stream Security is required at

问题 As part of error handling for our processes, we have tried to disable the communication between the process to the database machine listener port using the following iptables command iptables -A INPUT -p tcp --destination-port <database-listener-port> -s <database-host-ip> -j DROP However, this cause the process to get stuck with the following log coming from AbstractPlatformTransactionManager::getTransaction DEBUG: Creating new transaction with name [<Transaction-Name>]: PROPAGATION_REQUIRED

问题 I'm trying to open connections ( sockets ) to my Erlang server; everything works fine with around 100 paralell connections, but when I want more than 100 i get {error, closed}. It may be something that has to do with OS file descriptor limit ? If yes, can you guys please give me a solution? I use MacOS and CentOS. Should I give some params to the Erlang Vm in vm.args file? 回答1: Open sockets limit in erlang relies on two things: OS max open files limit, you can check how two tune it here

问题 Fatal error: Uncaught exception 'MongoConnectionException' with message 'Failed to connect to: localhost:27017: Permission denied' in /var/www/html/test.php:8 Stack trace: #0 /var/www/html/test.php(8): MongoClient->__construct() #1 {main} thrown in /var/www/html/test.php on line 8 Hi Mongo experts... I am a developer wanting to try out MongoDB. So installed centoOS 6.5 64bit in a test machine (Dell E520 Intel Dual Core 4GB Ram), installed PHP (Apache was already present). Then installed

问题 HI, I've just installed Oracle 10 g Express Edition on to my laptop. The platform is Windows XP SP3. Installation went normally. BUt when I try to get connected to the Oracle database via SqlPlus I get "TNS Protocol adapter error".My laptop is on the network.I'd installed the same database on to a Windows Server 2003 and it works fine. What could the problem be? 回答1: I presume this is ORA-12560: TNS:protocol adapter error . The Oracle documentation describes it as a generic TNS error, but

问题 right now i am creating a ssh tunnel, so i can connect to my remote database, but for some reason the connection is still refusing... my script: try { $host = 'remote host'; $sshuser = 'ssh user'; $sshpass = 'ssh password'; $dbuser = 'db user'; $dbpass = 'db user'; $dbname = 'db name'; shell_exec("ssh -p$sshpass ssh -o StrictHostKeyChecking=no -f -L 3307:127.0.0.1:3306 $sshuser@$host"); $dbh = new PDO('mysql:host=127.0.0.1;port=3307;dbname=' .$dbname. '', $dbuser, $dbpass); $sth = $dbh-

问题 I have a desktop pc with wifi connection.My ip address is 192.168.12.95 and gateway is 192.168.10.10 .But i am not getting internet connection in the android emulator.That is i can not able to acess internate. I have also try with " emulator -avd wbut -http-proxy 192.168.10.10:3128 " this command. But sometimes i get the connection in the emulator without doing anything. Can someone please tell me how can i get internet connection in my android emulator ? 回答1: Click F8 key after starting