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  • Ubuntu networking issue: two specific machines cannot browse web while connected to network at the same time.

    - by jensendarren
    I have setup a secure wireless network which works very well except for two laptops running Ubuntu 10.10 that can't access the Internet via a browser at the same time. They can both ping sites, wget sites, use skype but when using a browser the page never loads (in Firefox the status bar just sits there saying "Connecting" until it times out.) Here is what we have tried so far (nothing has fixed this issue): OpenDNS Restart networking services Using wired connection rather than wireless Removing all other nodes from the network except the two machines that have this issue Swapped out the router Factory reset the router Reformatted one of the machines and re-installed Ubuntu 10.10 Other things that we have checked: The two machines can connect simultaneously without any issues to other wireless networks in different locations (say in an Internet Cafe or another office) The two machines have unique IP addresses The two machines have unique MAC addresses The two machines can communicate on the network using Skype, wget, ping etc We are not using a proxy on either machine FYI: I have attached output from wireshark. For the test we turned both machines on and pointed them both to the same website. The content loaded on one and not the other. Here is the output from wireshark- (speedyshare.com/files/26228631/machine_output_1 && speedyshare.com/files/26228649/machine2). As you can see the first one worked, the second one didn't. I don't fully understand the output and would appreciate if someone could shed some light on what might be causing this and how we can fix it! Many thanks! Darren

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  • Self-connecting printers

    - by Martin Cerny
    Hello, I work as an administrator in a small company using XP Professional on all computers and two servers with Win 2003 Server. Recently a very unusual problam occured one of the computers keeps connecting to all the printers on the network it doesn't matter if it's an administrator or Domain User as soon as somebody logs in the commputer connects all the printers. The printers are either installed on local computers or on the server and shared. There is no log-on script connecting the printers, I install them manualy and none of the other computers shows such behaviour. We have a printer which is installed on two computers and both of them share it (I'm moving it to Server from a small PC which shared it up to now, but some computers still use the old connection), meaning this specific computer connects to one of the printer two times and it can't use either of the connections. How to prevent this self-connecting to all printers (none of the other computers has this problem). If I delte them from the "Printers" folder everything works fine untill I reconnect and the Folder is once again full of all the printers we have. I solved the smaller problem, computer is now capable of printing on all of the printers (it seems there have been some registry issues), after cleaning the registry and reinstalling the printer it seems to work just fine. But the second thing prevails, the computer connects to all the printers in the network (when I remove one/multiple it is reconnected right after the next log-in by any user).

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  • SQL Server 2008 login problem with ASP.NET application: Failed to open the explicitly specified database

    - by eulerfx
    I am running SQL Server 2008 Express Edition on Windows Server 2008 with an ASP.NET application which must access the server. The ASP.NET application is associated with an application pool that runs on the NetworkService account. This account in turn has a Login and User record on SQL Server in the required database. When I attempt to run the ASP.NET website I get a blank page and when viewed in the error log, I seem to be getting this information event record: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: myLocalMachine] The connection string has Trusted_Connection=True; and the required database specified. When I explicitly specify the user name and password I get another login error stating the password is incorrect, even though the same un/pw combination works through SQL Server Management studio. The NETWORK SERVICE account seems to have all the required privileges for the database. Also, I made a test ASP.NET website project which does a simple select from a table in that database, and using the same config file I am not getting the error and it seems to work. Is it something to do with trust levels then, because the original ASP.NET web app references various DLLs including open source libraries. Also, the application does not seem to be able to write to the event log itself, throwing a security exception, even though everything in the config files, including machine.config states the app is in full trust.

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  • Turning on multiple result sets in an ODBC connection to SQL Server

    - by David Griffiths
    I have an application that originally needed to connect to Sybase (via ODBC), but I've needed to add the ability to connect to SQL Server as well. As ODBC should be able to handle both, I thought I was in a good position. Unfort, SQL Server will not let me, by default, nest ODBC commands and ODBCDataReaders - it complains the connection is busy. I know that I had to specify that multiple active result sets (MARS) were allowed in similar circumstances when connecting to SQL Server via a native driver, so I thought it wouldn't be an issue. The DSN wizard has no entr y when creating a SystemDSN. Some people have provided registry hacks to get around this, but this did not work (add a MARS_Connection with a value of Yes to HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI\system-dsn-name). Another suggestion was to create a file-dsn, and add "MARS_Connection=YES" to that. Didn't work. Finally, a DSN-less connection string. I've tried this one (using MultipleActiveResultSets - same variable as a Sql Server connection would use), "Driver={SQL Native Client};Server=xxx.xxx.xxx.xxx;Database=someDB;Uid=u;Pwd=p;MultipleActiveResultSets=True;" and this one: "Driver={SQL Native Client};Server=192.168.75.33\\ARIA;Database=Aria;Uid=sa;Pwd=service;MARS_Connection=YES;" I have checked the various connection-string sites - they all suggest what I've already tried.

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  • Creating a simple command line interface (CLI) using a python server (TCP sock) and few scripts

    - by VN44CA
    I have a Linux box and I want to be able to telnet into it (port 77557) and run few required commands without having to access to the whole Linux box. So, I have a server listening on that port, and echos the entered command on the screen. (for now) Telnet 192.168.1.100 77557 Trying 192.168.1.100... Connected to 192.168.1.100. Escape character is '^]'. hello<br /> You typed: "hello"<br /> NOW: I want to create lot of commands that each take some args and have error codes. Anyone has done this before? It would be great if I can have the server upon initialization go through each directory and execute the init.py file and in turn, the init.py file of each command call into a main template lib API (e.g. RegisterMe()) and register themselves with the server as function call backs. At least this is how I would do it in C/C++. But I want the best Pythonic way of doing this. /cmd/ /cmd/myreboot/ /cmd/myreboot/ini.py (note underscore don't show for some reason) /cmd/mylist/ /cmd/mylist/init.py ... etc IN: /cmd/myreboot/_ini_.py: from myMainCommand import RegisterMe RegisterMe(name="reboot",args=Arglist, usage="Use this to reboot the box", desc="blabla") So, repeating this creates a list of commands and when you enter the command in the telnet session, then the server goes through the list, matches the command and passed the args to that command and the command does the job and print the success or failure to stdout. Thx

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  • How can I use net.tcp without ISS?

    - by user351025
    I have a web site and build a wcf service in it. I can run the code by calling it from a test page in the web site. The web site is ran by the vs2010 development server. I do have IIS 7 but never use it. Now I want to use the NetTcpBinding instead of BasicHttpBinding, everyone says it should be enabled in IIS, but how can this be done without using IIS? Thanks for any help

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  • Webserver Responses Hanging

    - by drscroogemcduck
    From some networks requesting certain images on our webserver is very flakey. I've looked at tcpdumps on both sides and the server sends back part of the file and the client ACKs the TCP packet but the server never receives the ACK. The servers view: 41 19.941136 212.169.34.114 209.20.73.85 TCP 52456 > http [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=2 42 19.941136 209.20.73.85 212.169.34.114 TCP http > 52456 [SYN, ACK] Seq=0 Ack=1 Win=5440 Len=0 MSS=1360 46 20.041142 212.169.34.114 209.20.73.85 TCP 52456 > http [ACK] Seq=1 Ack=1 Win=65280 Len=0 47 20.045142 212.169.34.114 209.20.73.85 HTTP GET /map/map/s+74-WBkWk0aR28Yy-YjXA== HTTP/1.1 48 20.045142 209.20.73.85 212.169.34.114 TCP http > 52456 [ACK] Seq=1 Ack=522 Win=6432 Len=0 49 20.045142 209.20.73.85 212.169.34.114 TCP [TCP segment of a reassembled PDU] (Part of the content of the image 2720 bytes. i assume it is reassembled in tcpdump and it is fragmented over the wire.) ** never receives the ACK sent in frame 282 and will eventually resend the tcp segment ** The clients view: 274 26.161773 10.0.16.67 209.20.73.85 TCP 52456 > http [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=2 276 26.262867 209.20.73.85 10.0.16.67 TCP http > 52456 [SYN, ACK] Seq=0 Ack=1 Win=5440 Len=0 MSS=1360 277 26.263255 10.0.16.67 209.20.73.85 TCP 52456 > http [ACK] Seq=1 Ack=1 Win=65280 Len=0 278 26.265193 10.0.16.67 209.20.73.85 HTTP GET /map/map/s+74-WBkWk0aR28Yy-YjXA== HTTP/1.1 279 26.365562 209.20.73.85 10.0.16.67 TCP http > 52456 [ACK] Seq=1 Ack=522 Win=6432 Len=0 280 26.368002 209.20.73.85 10.0.16.67 TCP [TCP segment of a reassembled PDU] (Part of the content of the image. Only 1400 bytes.) 282 26.571380 10.0.16.67 209.20.73.85 TCP 52456 > http [ACK] Seq=522 Ack=1361 Win=65280 Len=0 The network we are having trouble with is NATd. Is there any kind of explanation for this weirdness?

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  • Can't access random web pages on my MacBook Pro 2012?

    - by Faruk Sahin
    Sometimes I can't access random web pages. The page simply doesn't load. If I wait for around a minute doing nothing, it will load. It happens very random and very intermittent. Sometimes it starts when I try to access youtube.com or cnn.com. When it starts, it happens once in a minute or once in 5 minutes for random web pages. But if I am downloading something, the download continues without any interruption. And also I am able to ping the address I can't browse. Then if I wait for around a minute, everything starts to work fine at the browser side also. I have tried a lot of different browsers. I have tried changing my DNS servers to Google's public DNS servers. Using a cable instead of the wireless connection doesn't work either. No one else in the network has this problem, but me. What can be the problem?

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  • Linux Centos 6 becomes unavailable from time to time - OS&network issue

    - by adoado0
    I am encountering following problem. There is one server (DL160 G5) running Centos 6.3 with default kernel 2.6.32-220.2.1.el6.x86_64 - at this point I'd like to add that issue appeared also at older version - 6.1 and older kernel (do not remember exactly which version). There is cPanel installed and from time to time it becomes unavailable (network connection). What I've checked is (via KVMoIP): load average is completely normal it does not lack memory or disk space when problem occurs no console notifications checked all access logs and there is no sign that it can be caused by a client script cannot even access local interface (127.0.0.1) or main IP address running tcpdump I can only see packets arriving to server - no responses all services seem to be running properly (mail,sql,http,ssh) checked crontab and all clients' crontabs too network port utilisation is low ( up to several Mbits) arriving packet rate is low - hundreds per second (according to tcpdump) console (via kvmoip) works fine, no lags there is no conntrack at this server there is no ipv6 at this server flushing iptables, unloading modules does not resolve problem restarting network does not resolve problem, no errors appear it also occurs when two sepearate networks are configured (and multiple gateways) as well as one IP, one default gw and one network is configured - so it seems network configuration independent it seems to repeat randomly (load,packet rate,bandwith usage,load independent) checked server with different rootkit detection tools - it seems to be clean server has been rebooted, it did not change anything there are no interface errors it apperas randomly can be once a week or several times per day It usually works fine after 1-15 minutes. What I can also check? It is definitely OS issue - there is traffic at interface only in one direction when problem occurs, can not even ping loopback. Any ideas? Recommended checks? Anything I did not checked above.

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  • a free logging proxy anybody (HTTP or TCP)?

    - by zvolkov
    I need to debug a web service. I want to point my client app to the proxy URL and point the proxy to the real service URL and see all requests/responses. I know I could do network sniffing (Wireshark/Ethereal) but isn't there a simple "proxy" app that can do this? I found trivialproxy but the links are broken :(

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  • Certificates in SQL Server 2008

    - by Brandi
    I need to implement SSL for transmissions between my application and Sql Server 2008. I am using Windows 7, Sql Server 2008, Sql Server Management Studio, and my application is written in c#. I was trying to follow the MSDN page on creating certificates and this under 'Encrpyt for a specific client', but I got hopelessly confused. I need some baby steps to get further down the road to implementing encryption successfully. First, I don't understand MMC. I see a lot of certificates in there... are these certificates that I should be using for my own encryption or are these being used for things that already exist? Another thing, I assume all these certificates are files are located on my local computer, so why is there a folder called 'Personal'? Second, to avoid the above issue, I did a little experiment with a self-signed assembly. As shown in the MSDN link above, I used SQL executed in SSMS to create a self-signed certificate. Then I used the following connection string to connect: Data Source=myServer;Initial Catalog=myDatabase;User ID=myUser;Password=myPassword;Encrypt=True;TrustServerCertificate=True It connected, worked. Then I deleted the certificate I'd just created and it still worked. Obviously it was never doing anything, but why not? How would I tell if it's actually "working"? I think I may be missing an intermediate step of (somehow?) getting the file off of SSMS and onto the client? I don't know what I'm doing in the least bit, so any help, advice, comments, references you can give me are much appreciated. Thank you in advance. :)

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  • Steps to debugging web site latency and timeout issues

    - by Paperjam
    I have a client who has multiple offices around the country, all of which share the same Internet connection via their WAN. One specific office for this client is experiencing severe latency and timeout issues with my web site. Most, but not all, of the latency occurs on a specific ASPX page where multiple postbacks are made while populating cascading dropdown lists (rapid form submits). The latency is sporadic and can be anywhere from a few seconds to a full timeout. There is no indication that the timeouts are occurring on the server's end. The IT guy for this client is having trouble narrowing down the problem. Since it is affecting only one location for one client, I am led to believe it is not something with my site but something specific to that location. He's measured ping times while using the site and has noticed no real variance in ping times even when the page has timed out. I believe this may be being caused by some sort of Internet filter that doesn't like rapid form submits, but beyond a hunch I haven't a clue. My question is what things should I tell the IT guy to look for? While I'm not trying to provide active tech support for this issue, I would at least like to glean an understanding of what is going on and try to offer some sort of advice. Thank you.

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  • data transfer rate anomaly (internet)

    - by Nrew
    I tested my internet speed at speedtest.net. And go the result. .42Mbps Download and .21 Upload rate. My classmate got the same download speed of .42Mbps but has .87Mbps upload rate. Does upload rate affect the transfer rate?Because even though we got the same download speed. His transfer rate is about 100kbps downloading a movie from a torrent. And mine is only about 47kbps. Also the same torrent. And even direct download its always 47kbps. Is it possible to tweak something in order to have higher transfer rates. Other details: Were also both using the same ISP. The same slow ISP. And it seems that he's getting the most out of his connection even if his plan is lower than mine. I just don't know why I'm a loser at this. And when I try to complain to the ISP. They say that I'm getting the minimum speed and its okay. That really sucks. And I'm not using any router, so is he. The computer is directly connected to the internet using the modem provided by the ISP.

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  • n00b: receive input over TCP/IP and use it to update HTML

    - by mawg
    This has got to be a FAQ, so can someone please just direct me to a "network programming for dummies" URL? The server wants to push information to a client or broadcast to all, when an event happens - as opposed to the clients constantly polling the server "just in case". The client then updates a browser page display. How do I do that? (toldya it was a n00b question) Should I have a thread which receives info on a socket and then writes it to a database which the browser display (PHP) can process with an HTML refresh tag, or what? Sorry to sound so dumb.

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  • .NET connecting to oracle problems with the connectionstring

    - by Oxymoron
    At the moment I'm trying to make a connection to a local server. Connecting via, say, TOAD works fine. When I try to connect using .NET I get ora-12154. Which puzzles me, since I'm using the connectionstring from my TNSNAMES.ora file: XE = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = myPC)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE) ) ) As follows: private string connectionString = "Data Source=(DESCRIPTION =" +" (ADDRESS_LIST=(ADDRESS = (PROTOCOL = TCP)(HOST = myPC)(PORT = 1521)))" +" (CONNECT_DATA = (SERVER = DEDICATED)(SERVICE_NAME = XE));" +"User Id=sys;Password=zsxyzabc;"; Any ideas?

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  • Cannot create a new VS data connection in Server Explorer

    - by Seventh Element
    I have a local instance of SQL Server 2008 express edition running on my development PC. I'm trying to create a new data connection through Visual Studio Server Explorer. The steps are the following: Right click the "Data Connections" node = Choose Data Source. I select "Microsoft SQL Server" as the data source. The "Add Connection" dialog window appears. I select my local server instance = "Test connection" works fine. I select "AdventureWorks" as the database name = "Test connection" works fine. Next I hit the "Ok" button = Error message: "This server version is not supported. Only servers up to MS SQL Server 2005 are supported." I'm using Visual Studio 2008 Professional Edition. The target framework of the application is ".NET framework 3.5". I have a reference to System.Data (framework v2.0) and cannot find another version of the assembly on my system. Am I referencing the wrong assembly? How can I fix this problem?

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  • tcp/ip accept not returning, but client does

    - by paquetp
    server: vxworks 6.3 calls the usual socket, bind, listen, then: for (;;) { client = accept(sfd,NULL,NULL); // pass client to worker thread } client: .NET 2.0 TcpClient constructor to connect to server that takes the string hostname and int port, like: TcpClient client = new TcpClient(server_ip, port); This is working fine when the server is compiled and executed in windows (native c++). intermittently, the constructor to TcpClient will return the instance, without throwing any exception, but the accept call in vxWorks does not return with the client fd. tcpstatShow indicates no accept occurred. What could possibly make the TcpClient constructor (which calls 'Connect') return the instance, while the accept call on the server not return? It seems to be related to what the system is doing in the background - it seems more likely to get this symptom to occur when the server is busy persisting data to flash or an NFS share when the client attempts to connect, but can happen when it isn't also. I've tried adjusting priority of the thread running accept I've looked at the size of the queue in 'listen'. There's enough. The total number of file descriptors available should be enough (haven't validated this yet though, first thing in the morning)

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  • Performance-optimizing Oracle 10g on a server that is also a Tomcat JSP app server?

    - by PKHunter
    I have inherited a simple RedHat 5 - 64bit platform. It has SCSI disks on RAID1, with 16GB of RAM. Double Core CPU. Oracle 10g, Release 2. This would be a decent platform for running the DB only, perhaps, but the same server in an "A-A mode" clustering (very simple) also runs Tomcat and there are several Java servlets running on this. Sadly there is no caching platform etc. We only use an external CDN for some html caching. I am personally more familiar with web environments on the LAMPP platform (apache, php, mysql, postgresql). PROBLEM: Because the server has both Tomcat JSP/Java and Oracle 10g running on the same server, with no caching, I have some issues of the server going down. Often, sadly. QUESTION: What are my options in terms of improving performance of all these different apps? Connection Pooling? Example, in Postgresql world we have PgBouncer, which really helps things. Does Oracle have something similar? Or is there a famous Java-based external pooler that people use in production environments? (I'm not familiar with Java) Any "SQL cache" as in the MySQL and Postgresql world? Any other kind of application cache, as "APC" or "eAccelarator" in the PHP world? The "OSCache" stuff from the Java world (JSP thingie I found on Google: http://onjava.com/pub/a/onjava/2005/01/05/jspcache.html?page=2) ... What else? Sorry if this is a noob question. I have googled and googled, but problem is I don't know what to google for, other than the broad general concepts above. So if not full answers, I would even appreciate basic pointers and I am happy to JFGI myself. Thanks!

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  • I have just created a subnet for a local network, connecting to a standalone server on another network, now I cannot connect to the internet

    - by Seth
    I am just learning some new aspects of servers and networking. We have a network of 5 subnets that all interconnect with each-other. In order to get two computers on the subnet that we were setting up, I changed the IP from the subnet where the standalone server is on (where they used to be set up)to the local subnet we are remotely hooking up. Likewise I also changed the gateway to coincide with the new subnet. Only problem is that since doing this, I am unable to establish a connection to the internet. I can ping the server and correspong gateway & DNS server, but cannot get connected to the internet. We do have a dumb-switch (non-programmable) connected that receives both the internet and private network inputs and distributes (or should do so) to about 5 other computers. Bottom line, I cannot currently connect to the internet, and am wondering what could be causing this.. It is likely something very obvious and pardon me being more vague than I probably should be, but I could use some help resolving this! Thanks for any help!

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  • Receive input over TCP/IP and use it to update HTML

    - by mawg
    This has got to be a FAQ, so can someone please just direct me to a "network programming for dummies" URL? The server wants to push information to a client or broadcast to all, when an event happens - as opposed to the clients constantly polling the server "just in case". The client then updates a browser page display. How do I do that? (toldya it was a n00b question) Should I have a thread which receives info on a socket and then writes it to a database which the browser display (PHP) can process with an HTML refresh tag, or what? Sorry to sound so dumb.

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  • No database connection when trying to use IIS locally with asp.net MVC 1.0

    - by mark4asp
    Login failed for user ''. The user is not associated with a trusted SQL Server connection. When I try to use IIS locally instead of Cassini I get this error. The ASP.NET MVC 1.0 site is running on WinXP. The database is local and has SQL Server and Windows Authentification mode enabled. The website runs OK using Cassini, with the same connection string. It fails when I try to use IIS instead of Cassini. These permissions are set on the Virtual directory which IIS points to. ASP.NET Machine Account [Full Control] Internet Guest Account [Full Control] System [Full Control] This virtual directory is the same are the directory holding my project files. I am using Linq and the database connection string is stored in the App.config file of my data project. I get the same error whether I set the connection string to use Windows or Sql server authentification. My sql server has both [MyMachineName\ASPNET] and SqlServerUser Logins and a User on the database. CREATE LOGIN [MyMachineName\ASPNET] FROM WINDOWS WITH DEFAULT_DATABASE=[master], DEFAULT_LANGUAGE=[us_english] Use My_database CREATE USER [MyMachineName\ASPNET] FOR LOGIN [MyMachineName\ASPNET] WITH DEFAULT_SCHEMA=[dbo] CREATE LOGIN [MwMvcLg] WITH PASSWORD=N'blahblah', DEFAULT_DATABASE=[master], DEFAULT_LANGUAGE=[British], CHECK_EXPIRATION=OFF, CHECK_POLICY=ON Use My_database CREATE USER [MwMvcLg] FOR LOGIN [MwMvcLg] WITH DEFAULT_SCHEMA=[dbo] How come I have no problem running this website on IIS6 remotely. Why does IIS5.1, running locally, need these extra logins? PS: My overwhelming preference is to use Sql Server authentification - as this is how it runs when deployed.

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  • http connection timeout issues

    - by Mark
    I'm running into an issue when i try to use the HttpClient connecting to a url. The http connection is taking a longer time to timeout, even after i set a connection timeoout. int timeoutConnection = 5000; HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); int timeoutSocket = 5000; HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); It works perfect most of the time. However, every once in while, the http connection runs for ever and ignore the setconnectiontimeout, especailly when the phone is connected to wifi, and the phone was idling. So after the phone is idling, the first time i try to connect, the http connection ignores the setconnectiontimeout and runs forever, after i cancel it and try again, it works like charm everytime. But that one time that doesn't work it creates a threadtimeout error, i tried using a different thread, it works, but i know that the thread is running for long time. I understand that the wifi goes to sleep on idle, but i dont understand why its ignoring the setconnectiontimeout. Anyone can help, id really appreciated.

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