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  • Methods and practices for managing a network that has no internet connection

    - by FaultyJuggler
    Originally asked in Super User but realized this belongs here. Long story short, I am setting up a network with 32 servers of varying specs that will be used for testing and development. We will be using RedHat Linux, we also do not have a router as of yet and were looking into making one of the servers act as our router/DHCP etc. The small cluster will be on an isolated network with no internet. I can use external harddrives and discs to transfer anything from external sources into machines on the network, so this isn't a locked down secure network, it just won't have a direct connection to the outside world. I've worked on such setups before, but always long after they were setup. So I'm reaching out to see what everyone knows as far as how groups have handled initial setup and maintenance of such a situation. What is the best way to get them all configured and up to date? What are the best ways to automate updates, network wide installs, etc. With the only given that I have large multi-terabyte external hard drives that would be used to drop whatever files are needed onto a central server, how do i then distribute those files and install their contents? I've done perl scripting, some teammates have played with puppet, so we aren't completely in the dark, I just wanted to avoid reinventing the wheel since this is a common challenge.

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  • Elmah for non-HTTP protocol applications OR Elmah without HttpContext

    - by Josh
    We are working on a 3-tier application, and we've been allowed to use the latest and greatest (MVC2, IIS7.5, WCF, SQL2k8, etc). The application tier is exposed to the various web applications by WCF services. Since we control both the service and client side, we've decided to use net.tcp bindings for their performance advantage over HTTP. We would like to use ELMAH for the error logging, both on the web apps and services. Here's my question. There's lots of information about using ELMAH with WCF, but it is all for HTTP bindings. Does anyone know if/how you can use ELMAH with WCF services exposing non-HTTP endpoints? My guess is no, because ELMAH wants the HttpContext, which requires the AspNetCompatibilityEnabled flag to be true in the web.config. From MSDN: IIS 7.0 and WAS allows WCF services to communicate over protocols other than HTTP. However, WCF services running in applications that have enabled ASP.NET compatibility mode are not permitted to expose non-HTTP endpoints. Such a configuration generates an activation exception when the service receives its first message. If it is true that you cannot use ELMAH with WCF services having non-HTTP endpoints, then the follow-up question is: Can we use ELMAH in such a way that doesn't need HttpContext? Or more generally (so as not to commit the thin metal ruler error), is there ANY way to use ELMAH with WCF services having non-HTTP endpoints?

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  • C# Sockets Buffer Overflow No Error

    - by Michael Covelli
    I have one thread that is receiving data over a socket like this: while (sock.Connected) { // Receive Data (Block if no data) recvn = sock.Receive(recvb, 0, rlen, SocketFlags.None, out serr); if (recvn <= 0 || sock == null || !sock.Connected) { OnError("Error In Receive, recvn <= 0 || sock == null || !sock.Connected"); return; } else if (serr != SocketError.Success) { OnError("Error In Receive, serr = " + serr); return; } // Copy Data Into Tokenizer tknz.Read(recvb, recvn); // Parse Data while (tknz.MoveToNext()) { try { ParseMessageAndRaiseEvents(tknz.Buffer(), tknz.Length); } catch (System.Exception ex) { string BadMessage = ByteArrayToStringClean(tknz.Buffer(), tknz.Length); string msg = string.Format("Exception in MDWrapper Parsing Message, Ex = {0}, Msg = {1}", ex.Message, BadMessage); OnError(msg); } } } And I kept seeing occasional errors in my parsing function indicating that the message wasn't valid. At first, I thought that my tokenizer class was broken. But after logging all the incoming bytes to the tokenizer, it turns out that the raw bytes in recvb weren't a valid message. I didn't think that corrupted data like this was possible with a tcp data stream. I figured it had to be some type of buffer overflow so I set sock.ReceiveBufferSize = 1024 * 1024 * 8; and the parsing error never, ever occurs in testing (it happens often enough to replicate if I don't change the ReceiveBufferSize). But my question is: why wasn't I seeing an exception or an error state or something if the socket's internal buffer was overflowing before I changed this buffer size?

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  • .NET Sockets Buffer Overflow No Error

    - by Michael Covelli
    I have one thread that is receiving data over a socket like this: while (sock.Connected) { // Receive Data (Block if no data) recvn = sock.Receive(recvb, 0, rlen, SocketFlags.None, out serr); if (recvn <= 0 || sock == null || !sock.Connected) { OnError("Error In Receive, recvn <= 0 || sock == null || !sock.Connected"); return; } else if (serr != SocketError.Success) { OnError("Error In Receive, serr = " + serr); return; } // Copy Data Into Tokenizer tknz.Read(recvb, recvn); // Parse Data while (tknz.MoveToNext()) { try { ParseMessageAndRaiseEvents(tknz.Buffer(), tknz.Length); } catch (System.Exception ex) { string BadMessage = ByteArrayToStringClean(tknz.Buffer(), tknz.Length); string msg = string.Format("Exception in MDWrapper Parsing Message, Ex = {0}, Msg = {1}", ex.Message, BadMessage); OnError(msg); } } } And I kept seeing occasional errors in my parsing function indicating that the message wasn't valid. At first, I thought that my tokenizer class was broken. But after logging all the incoming bytes to the tokenizer, it turns out that the raw bytes in recvb weren't a valid message. I didn't think that corrupted data like this was possible with a tcp data stream. I figured it had to be some type of buffer overflow so I set sock.ReceiveBufferSize = 1024 * 1024 * 8; and the parsing error never, ever occurs in testing (it happens often enough to replicate if I don't change the ReceiveBufferSize). But my question is: why wasn't I seeing an exception or an error state or something if the socket's internal buffer was overflowing before I changed this buffer size?

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  • Flat File Connection Manager in SSIS package shows "Valid File Name Must be Selected"

    - by Traples
    (Flat File Location) Samba Share | Windows Share (SSIS) _______________________________ | | XP 32bit | Works | Works | | 2003 Serv 32bit | Works | Works | | Vista 64bit | ERROR | Works | | Win 7 64bit | ERROR | Works | | 2008 Serv 64bit | ERROR | Works I created an SSIS package in VS 2008 that parses a flat file from a shared folder and puts the records into a SQL Server db. I recently installed Windows 7 and VS 2008 on a new workstation. When I import the package from TFS and open it, I get the error Validation error. Parse and Import Catalog Flat File: MySSISPackage: The file name "\\shared\flatfile.txt" specified in the connection was not valid. When I open the Flat File Connection Manager Editor, there is an error stating: A valid file name must be selected I can browse to and select the file from inside the editor, but I cannot change any properties, or move away from the General tab because of this error. If I go back to my laptop (Windows XP), where the package was first created, there is no error. Both workstations are on the same domain, and I'm logging in using the same credentials. Any ideas as to why I would receive this error from one workstation and not another? UPDATE: If I take the .dtsx package from the running workstation and load it into SSIS on the server, I get the following errors when it tries to run: Error: The file name "\\shared\flatfile.txt" specified in the connection was not valid. and... Error: Connection "MySSISPackage" failed validation. and... Error: The file name property is not valid. The file name is a device or contains invalid characters. UPDATE 2: a) The Shared folder I'm trying to pull the flat file from is a Samba share on a Unix box. b) If I access the file using SSIS on any 64-bit platform (Windows 7 64-bit, Vista 64-bit, Windows Server 2008) I get the error "A valid file name must be selected." c) Accessing the file using SSIS from 32-bit environments (Windows XP 32-bit, Windows Server 2003 32-bit) there is no problem. d) If I move the file to a shared folder on a Windows server, 64-bit SSIS recognizes the file.

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  • What is the difference between "ORA-12571: TNS packet writer failure" and "ORA-03135: connection los

    - by Philippe
    I am working in an environment where we get production issues from time to time related to Oracle connections. We use ODP.NET from ASP.NET applications, and we suspect the firewall closes connections that have been in the connection pool too long. Sometimes we get an "ORA-12571: TNS packet writer failure" error, and sometimes we get "ORA-03135: connection lost contact." I was wondering if someone has run into this and/or has an understanding of the difference between the 2 errors.

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  • NHibernate : restore session connection after session lost

    - by Catalin DICU
    I'm using NHibernate with SQL Server 2005 in a WPF client application. If I stop the SQL Server service and then restart it the session doesn't automatically reconnect. So far I'm doing this witch seems to work : try { using (ITransaction transaction = this.Session.BeginTransaction()) { // some select here } }catch(Exception ex) { if(this.Session.Connection.State == ConnectionState.Closed) { try { this.Session.Connection.Open(); } catch (Exception) { } } } Is there a better way ?

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  • iReport ejbql connection

    - by Nayan Wadekar
    I want to create ejbql connection in iReport, i have added all the related jars. Set the classpath to include the META-INF directory containing persistence.xml & jars. On testing connection it shows nothing, but in console it prints "java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.ejb.event.EJB3PersistEventListener null". Jar containing this class I have already added. persistence.xml content : persistence-unit name="hrmsPU" transaction-type="JTA" provider org.hibernate.ejb.HibernatePersistence provider jta-data-source java:hrmsDS jta-data-source persistence-unit

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  • Relative connection string to AzMan XML store when using security application block

    - by David Hall
    Is it possible to specify a relative connection string for an AzMan XML store? My current connection string is connectionString="msxml://c:/azman.xml" but I really need to make that relative so other developers and automated builds can get the latest authorization store. MS documentation seems to suggest that connectionString="msxml://azman.xml" should work but that throws a The request is not supported error. EDIT: I realised that the fact I'm using AzMan through the Enterprise Library Security Application Block was important to the question.

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  • ssL HTTPS for windows mobile 6::unable to read transport connection

    - by Santhosh
    Hi am trying Https ssl connection in my C# application...i am getting "Unable to read transport connection" for the line WebResponse response = (HttpWebResponse)request.GetResponse(); I am forcing Certificate to be accepted ServicePointManager.CertificatePolicy = new MyPolicy(); public class MyPolicy : ICertificatePolicy { public bool CheckValidationResult(ServicePoint sp, X509Certificate cert, WebRequest req, int problem) { return true; } } Working fine in WM5 may i plz know the wat is goin wrong?plz thanks in advance

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  • Weblogic connection pool

    - by Mauro Takeda
    I'm trying to create a connection pool in weblogic (8.1) and getting the following exception: <BEA-001129> <Received exception while creating connection for pool "testPool": 7> I have no clue about that number (7). How can I solve the problem?

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  • HTTPS connection in BlackBerry Java Midlet

    - by Casebash
    My Java ME Midlet works fine on Java phones and the BlackBerry simulator, but I can't receive a connection on a BlackBerry. I see a message that asks for permissions to connect, but when I select yes, it doesn't connect. I even checked on the server, but no connection was provided. My application isn't signed. Does anyone know why this might be failing?

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  • NSURLConnectionDelegate connection:didReceiveData not working

    - by Shibin Moideen
    Hi All, I need some help regarding the NSURLConnectionDelegate method. - (void)startDownload { NSString *URLString = [NSString stringWithFormat:appRecord.imageURLString]; NSURL *url = [NSURL URLWithString:URLString]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; imageConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; if(imageConnection) { activeDownload = [NSMutableData data]; } } I am using this method to initiate the NSURLConnection, but the - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data is not calling.. Need Help Thanks in advance, Shibin

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  • Handling connection errors in a MDB

    - by Rafa de Castro
    Is it possible to manage connection timeouts or errors in a MessageDrivenBean? You can make the factory to retry connecting a certain number of times but... is it possible to make some actions each time that a reconnection retrial is neccesary? Is it possible to register an ExceptionListener into the MessageDrivenBean's connection somehow? Thanks a lot.

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  • FTP Error: No control connection for command: Permission denied

    - by ravi2082
    Hi, I am trying to access a external ftp server through my company's FTP proxy from a bash prompt and I am getting the below issue after I enter the user name 421 Service not available, remote server has closed connection Login failed. No control connection for command: Permission denied The proxy works fine for all other sites but I am unable to access a site which has been recently setup using this proxy. Can it be an issue at the site's end like allowing our proxy ip address thru their firewall to access their server? Thanks

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  • NHibernate : recover session after connection lost

    - by Catalin DICU
    I'm using NHibernate with SQL Server 2005 in a WPF client application. If I manually stop the SQL Server service and then restart it the session doesn't automatically reconnect. So far I'm doing this witch seems to work : try { using (ITransaction transaction = this.Session.BeginTransaction()) { // some select here } }catch(Exception ex) { if(this.Session.Connection.State == ConnectionState.Closed) { try { this.Session.Connection.Open(); } catch (Exception) { } } } Is there a better way ?

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  • Remote MySQL connection fails (10060)

    - by Stefan Åstrand
    When I am trying to connect to a MySQL database from a remote computer I get a prompt saying: Connection Failed: [HY000] [MySQL][ODBC 5.1 Driver]Can't Connect to MySQL server on 'XXX.XXX.XX.XX' (10060) I have created a user account in the MySQL Administrator and added a host to enable remote access, I have also made an exception for my Windows Firewall on port 3306 but the connection still fails. What is the problem? Thanks!

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  • javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp] error with java scheduler

    - by Morgan Azhari
    What I'm trying to do is to update my database after a period of time. So I'm using java scheduler and connection pooling. I don't know why but my code only working once. It will print: init success success javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp]. at org.apache.naming.NamingContext.lookup(NamingContext.java:820) at org.apache.naming.NamingContext.lookup(NamingContext.java:168) at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158) at javax.naming.InitialContext.lookup(InitialContext.java:411) at test.Pool.main(Pool.java:25) ---> line 25 is Context envContext = (Context)initialContext.lookup("java:/comp/env"); I don't know why it only works once. I already test it if I didn't running it without java scheduler and it works fine. No error whatsoerver. Don't know why i get this error if I running it using scheduler. Hope someone can help me. My connection pooling code: public class Pool { public DataSource main() { try { InitialContext initialContext = new InitialContext(); Context envContext = (Context)initialContext.lookup("java:/comp/env"); DataSource datasource = new DataSource(); datasource = (DataSource)envContext.lookup("jdbc/test"); return datasource; } catch (Exception ex) { ex.printStackTrace(); } return null; } } my web.xml: <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <listener> <listener-class> package.test.Pool</listener-class> </listener> <resource-ref> <description>DB Connection Pooling</description> <res-ref-name>jdbc/test</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> Context.xml: <?xml version="1.0" encoding="UTF-8"?> <Context path="/project" reloadable="true"> <Resource auth="Container" defaultReadOnly="false" driverClassName="com.mysql.jdbc.Driver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" initialSize="0" jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" jmxEnabled="true" logAbandoned="true" maxActive="300" maxIdle="50" maxWait="10000" minEvictableIdleTimeMillis="300000" minIdle="30" name="jdbc/test" password="test" removeAbandoned="true" removeAbandonedTimeout="60" testOnBorrow="true" testOnReturn="false" testWhileIdle="true" timeBetweenEvictionRunsMillis="30000" type="javax.sql.DataSource" url="jdbc:mysql://localhost:3306/database?noAccessToProcedureBodies=true" username="root" validationInterval="30000" validationQuery="SELECT 1"/> </Context> my java scheduler public class Scheduler extends HttpServlet{ public void init() throws ServletException { System.out.println("init success"); try{ Scheduling_test test = new Scheduling_test(); ScheduledExecutorService executor = Executors.newScheduledThreadPool(100); ScheduledFuture future = executor.scheduleWithFixedDelay(test, 1, 60 ,TimeUnit.SECONDS); }catch(Exception e){ e.printStackTrace(); } } } Schedule_test public class Scheduling_test extends Thread implements Runnable{ public void run(){ Updating updating = new Updating(); updating.run(); } } updating public class Updating{ public void run(){ ResultSet rs = null; PreparedStatement p = null; StringBuilder sb = new StringBuilder(); Pool pool = new Pool(); Connection con = null; DataSource datasource = null; try{ datasource = pool.main(); con=datasource.getConnection(); sb.append("SELECT * FROM database"); p = con.prepareStatement(sb.toString()); rs = p.executeQuery(); rs.close(); con.close(); p.close(); datasource.close(); System.out.println("success"); }catch (Exception e){ e.printStackTrace(); } }

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  • Subgraph isomorphism on disconnected graphs with connection rules

    - by Mac
    Hello I was wondering if anyone knows about a solution to the following problem: Given a graph g as query and a set of graphs B with connection rules R. The connection rules describe how two graphs out of B can be linked together. Linking points are marked vertexes. Find all combination of graphs in B that contain g as a subgraph. Regards Mac

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  • SQL Server connection help...

    - by Gopal
    Using SQL Server 2005 I have the server connection name as (server1) in windows authentication mode, I want to change windows authentication mode to sql server authentication mode... when i try to change sql server authentication mode with username = sa & password = sa, it showing error... How to change the authentication mode or how to create a new sql connection?

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  • SQL Server connection identification

    - by andrew007
    Hi, I have several developers which connect to production and test servers where we have DBs with similar names and structures. In SSMS there are info related to the connection, but sometimes are not properly displayed and/or hidden. I know that it is possible to customize the status bar of each connection in SSMS, but how do you ensure that your developer is connecting to the right server before he runs a query? Is there any way to handle this? THANKS!

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