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  • Why can't I connect to remote Microsoft SQL Server through SSH tunnel?

    - by Alexander
    I have at home a D-Link DIR-615 C1 router with DD-WRT. I set up the SSH server on the router, and log on through an SSH2-RSA passphrase-protected key. That router is the gateway between the local network and the internet. One of the computers on that network has Microsoft SQL Server 2008 installed, with TCP/IP protocol enabled through port 1433. I've set up port forwarding on the router, so that remote connections are possible and are, in fact, working (some developers log on remotely without problems). I am part of another network, that has internet access through a proxy server, which only has ports 80 and 443 opened. I can't connect to that MSSQL server on that remote server because 1433 port is closed on this network. I connected (using Putty) through 443 port to my router's SSH server, and set up 2 tunnels. One is for RDP (3389), and it's working. The other is for 1433 port, to connect to the server. I can't connect through the SSH tunnel to the MS SQL Server, neither through telnet, or through GUI clients. Am I missing something? Additional details: on connect, I get this error from SQL Server Management Studio: TITLE: Connect to Server Cannot connect to localhost:14330. ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 3) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=3&LinkId=20476 BUTTONS: OK The tunnel is configured like this: L14330 192.168.0.103:1433 192.168.0.103 is the permanent address of the SQL Server on the LAN. I also successfully forwarded TCP traffic of 3389 port to that IP, so tunneling is working to that IP address. When connecting without tunnel, through Microsoft SQL Server Management Studio, using the same method the connection establishes. Too bad my proxy doesn't allow 1433 port traffic, I wouldn't have this headache.

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  • windows server 2003 cannot accept connections

    - by Seb
    Hi everyone, I am running a Windows Server 2003 OS and am noticing that no one is able to connect to the machine through Remote Desktop. I have gone through the Terminal Services Configuration to make sure that we had the RDP-Tcp connection enabled and I've checked to see that the server was listening to port 3389. Are there any other options since I've tried to ping into our host server with no results. Thanks in advance.

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  • problems with ASA 8.4 Nat Rules for a Web Server

    - by Marko
    Having problems with the NAT RULES and Access Rules changes on my ASA5505. Want to straight replace a 5505 with a newer 5505 and unfortunately this means dealing with old version 7.2 and the newer 8.4 configurations. my old NAT RULE: static (inside,outside) WebOutside WebInside netmask 255.255.255.255 and an Access Rule of: access-list outside_access_in extended permit tcp any host WebOutside eq www these dont work in 8.4 I understand there are some changed but I can find little information that makes any sense on how to configure these. Any pointers welcomed.

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  • Why can't I connect to remote Microsoft SQL Server through SSH tunnel?

    - by Alexander
    I have at home a D-Link DIR-615 C1 router with DD-WRT. I set up the SSH server on the router, and log on through an SSH2-RSA passphrase-protected key. That router is the gateway between the local network and the internet. One of the computers on that network has Microsoft SQL Server 2008 installed, with TCP/IP protocol enabled through port 1433. I've set up port forwarding on the router, so that remote connections are possible and are, in fact, working (some developers log on remotely without problems). I am part of another network, that has internet access through a proxy server, which only has ports 80 and 443 opened. I can't connect to that MSSQL server on that remote server because 1433 port is closed on this network. I connected (using Putty) through 443 port to my router's SSH server, and set up 2 tunnels. One is for RDP (3389), and it's working. The other is for 1433 port, to connect to the server. I can't connect through the SSH tunnel to the MS SQL Server, neither through telnet, or through GUI clients. Am I missing something? Additional details: on connect, I get this error from SQL Server Management Studio: TITLE: Connect to Server Cannot connect to localhost:14330. ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 3) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=3&LinkId=20476 BUTTONS: OK The tunnel is configured like this: L14330 192.168.0.103:1433 192.168.0.103 is the permanent address of the SQL Server on the LAN. I also successfully forwarded TCP traffic of 3389 port to that IP, so tunneling is working to that IP address. When connecting without tunnel, through Microsoft SQL Server Management Studio, using the same method the connection establishes. Too bad my proxy doesn't allow 1433 port traffic, I wouldn't have this headache.

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  • Error starting postgresql server on ubuntu

    - by xain
    Hi, I recently stopped the postgresql database (that was working perfectly), and after a couple of days, when I try to start it, I get the errors: 2011-01-03 23:56:27 CLST LOG: could not translate host name "localhost", service "5432" to address: Name or service not known 2011-01-03 23:56:27 CLST WARNING: could not create listen socket for "localhost" 2011-01-03 23:56:27 CLST FATAL: could not create any TCP/IP sockets I'm running Ubuntu 9.1, and I'm using the usuals /etc/init.d/postgresql-8.4 start and stop Any hints ?

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  • outbound ftp on server 2008 r2 stalls

    - by Scott Kramer
    the built in command line ftp client in server 2008 does not support passive mode so I've used these commands to allow outbound ftp (it stalls without this) 1) Open port 21 on the firewall netsh advfirewall firewall add rule name="FTP (no SSL)" action=allow protocol=TCP dir=in localport=21 2) Activate firewall application filter for FTP (aka Stateful FTP) that will dynamically open ports for data connections netsh advfirewall set global StatefulFtp enable however in server 2008 r2, these commands seem to work, but it does not affect the outbound ftp, it stalls I do not want to use an alt client

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  • JavaScript-based applications and text browsers

    - by Vi
    How to use complex AJAX applications with a lot of menus and with X.509 authentications in non-GUI mode with simple browsers? For example, I can login to Webmoney from console using links/lynx/link2 (but not w3m), entering captcha (using aaxine) and do operations there, but can't login not using X.509 certificate (even if I try to separate SSL part using "socat tcp-l:... openssl:...:443,cert=extracted_from_firefox.pem") Is there some program that behaves like fully-fledged browser (build DOM/execute JS/Support all features except of actually displaying things), but without GUI and dependencies on GUI libraries?

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  • Connect to remote MySQL using proxy

    - by hypeflow
    I'm trying to connect to a remote MySQL server (with TCP access limited to a specific IP) using port forwarding via SSH, but still haven't figured out how to do it. Here's what I intend to do: Local[A] ---> Proxy[B] ---> Remote MySQL[C] [A] Local machine with Windows [B] CentOS machine with IP 123.123.123.1 (with it's own MySQL running, btw) [C] Remote MySQL server with IP 123.123.123.1 authorized on port 3306 How to achieve this? Thanks in advance.

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  • Are EC2 security group changes effective immediately for running instances?

    - by Jonik
    I have an EC2 instance running, and it belongs to a security group. If I add a new allowed connection to that security group through AWS Management Console, should that change be effective immediately? Or perhaps only after restart of the instance? In my case, I'm trying to allow access to PostgreSQL's default port (tcp 5432 5432 0.0.0.0/0), and I'm not sure if it's the EC2 firewall or PostgreSQL's settings that are refusing the connection.

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  • Windows Server 2008 R2 loses ability to connect to network share

    - by JamesB
    I could sure use some help with this one: I've got two Windows Server 2008 R2 x64 Terminal Servers, as well as several 2003 servers (DNS / Wins / AD / DC). On the two 2008 boxes, every now and then they will get in this mode where you can't map a drive to a random server. I say random server because it's not always the same server that you can't map to. Here is a summary of what I can and can't do: net view \\servername Sometimes this works, sometimes it does not. net view \\FQDN This always works. net view \\IPAddress This always works. ping servername Sometimes this works, sometimes it does not. ping FQDN This always works. ping IPAddress This always works. I've been looking all over for a solution to this. It sure seems like Microsoft would have a hotfix by now. The kicker to this is that it sometimes works great, especially after a reboot. It may run for 2 weeks just fine, but all of a sudden it will fail to resolve the remote server name. It will then be this way for a few days, then it might start working again. Also, while it's in the mode of not working, the other servers have no problem getting there. It's just these 2008 R2 Terminal Servers. Setting a static entry in the Hosts file and LMHosts does not make it work. All servers have static IPs and they are registered in DNS and Wins just fine. Here is a long thread on MS Technet of the exact same problem, but they don't have a good solution. Here is their workaround (It was from June of 2010): Good news - a hotfix is in the works and a workaround has been identified: Root cause is that since this is SMB1 all user sessions are on a single TCP connection to the remote server. The first user to initiate a connection to the remote SMB server has their logon-ID added to the structure defining the connection. If that user logs off all subsequent uses of that TCP session fail as the logon-id is no longer valid. As a workaround for now to keep the issue from happening you will want to have the user not logoff the Terminal Server only disconnect their sessions. Any word from anyone out there about a solution? Any help would sure be appreciated. Thanks, James

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  • Authentication between web server and sql server

    - by thirster42
    So, we're restructuring out development environment. We've installed SQL Server onto it's own server, and we are publishing our internal web applications onto a seperate web server. However, the problem is that for some reason the authentication of the user between the web server and sql server gets lost, resulting in the Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON' error. Where do i start troubleshooting? SQL Server is set up for TCP and remote connections.

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  • How to monitor streaming servers

    - by pcdinh
    Hi all, I have had a bunch of Linux based streaming servers that employed lighttpd web server to provide video streaming via port 80. Recently, our service is very slow. Therefore, I would like to ask if there is a good software package that helps us monitor and record our bandwidth usage, lighttpd established connections, TCP sync connections, disk I/O ... over time. Any suggestions? Regards, Dinh

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  • Is it possible to open server ports on TUN devices?

    - by JosephH
    If I make a VPN connection to a server (say myvpn.com; assume this server is not behind any router/firewall) via a TUN device and open a port (say 5555), will someone else be able to connect to me via myvpn.com:5555? If not, is there a tunneling software that does exactly this in a transparent manner? i.e. run any TCP/UDP-based server instance behind a router without NAT using another remote server.

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  • Startup Folder, HKCU/.../Run, HKLM/.../Run. Where Else to Look to Track Down a Mysterious Login Even

    - by Bob Kaufman
    Starting around the time I installed the Office 2010 Beta, Whenever I login, Windows tries to open a file named "Bob", coincidentally the first part of my username. Selecting Notepad to open it, and it contains TCP/IP network settings. I've looked for and deleted unrecognized entries in my StartUp folder, in HKLM/.../CurrentVersion/Run and in HKCU/.../CurrentVersion/Run with no luck. Is there any other place I should be looking for errant entries?

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  • iptables - Allowing Established Sessions?

    - by Sandro Dzneladze
    I'm learning how to use iptables on ubuntu server. Can you please explain to me what "Allowing Established Sessions" means and why should I include it in rules? sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT I understand concept of allowing specific ports and blocking others sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT block all sudo iptables -A INPUT -j DROP But I don't get the concept of allowing established session. Thanks. S.

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  • A gigabit network interface is CPU-limited to 25MB/s. How can I maximize the throughput?

    - by netvope
    I have a Acer Aspire R1600-U910H with a nForce gigabit network adapter. The maximum TCP throughput of it is about 25MB/s, and apparently it is limited by the single core Intel Atom 230; when the maximum throughput is reached, the CPU usage is about 50%-60%, which corresponds to full utilization considering this is a Hyper-threading enabled CPU. The same problem occurs on both Windows XP and on Ubuntu 8.04. On Windows, I have installed the latest nForce chipset driver, disabled power saving features, and enabled checksum offload. On Linux, the default driver has checksum offload enabled. There is no Linux driver available on Nvidia's website. ethtool -k eth0 shows that checksum offload is enabled: Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp segmentation offload: on udp fragmentation offload: off generic segmentation offload: off The following is the output of powertop when the network is idle: Wakeups-from-idle per second : 61.9 interval: 10.0s no ACPI power usage estimate available Top causes for wakeups: 90.9% (101.3) <interrupt> : eth0 4.5% ( 5.0) iftop : schedule_timeout (process_timeout) 1.8% ( 2.0) <kernel core> : clocksource_register (clocksource_watchdog) 0.9% ( 1.0) dhcdbd : schedule_timeout (process_timeout) 0.5% ( 0.6) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) And when the maximum throughput of about 25MB/s is reached: Wakeups-from-idle per second : 11175.5 interval: 10.0s no ACPI power usage estimate available Top causes for wakeups: 99.9% (22097.4) <interrupt> : eth0 0.0% ( 5.0) iftop : schedule_timeout (process_timeout) 0.0% ( 2.0) <kernel core> : clocksource_register (clocksource_watchdog) 0.0% ( 1.0) dhcdbd : schedule_timeout (process_timeout) 0.0% ( 0.6) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) Notice the 20000 interrupts per second. Could this be the cause for the high CPU usage and low throughput? If so, how can I improve the situation? As a reference, the other computers in the network can usually transfer at 50+MB/s without problems. A computer with a Core 2 CPU generates only 5000 interrupts per second when it's transferring at 110MB/s. The number of interrupts is about 20 times less than the Atom system (if interrupts scale linearly with throughput.) And a minor question: How can I find out what is the driver in use for eth0?

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  • how to restrict null session

    - by jack
    Hi I've changed the following things in regedit and restarted PC to restrict null session: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\LSA Value Name: RestrictAnonymous Data Type: REG_DWORD Value: 1 Value Name: RestrictAnonymousSam Data Type: REG_DWORD Value: 1 Value Name: EveryoneIncludesAnonymous Data Type: REG_DWORD Value: 0 However, I can still run and get null session. net use //IP /u:"" "" command completed successfully I've also done "Disable NetBios over TCP/IP" but it didn't help. Any ideas?

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  • Why can't I access one specific website?

    - by user36590
    I can browse all websites except codinghorror.com in any of my browsers (IE, Firefox & Chrome), but that site is not down. Chrome gives this error msg: Error 109 (net::ERR_ADDRESS_UNREACHABLE): Unknown error There's absolutely no problem with internet connectivity. I also enabled TCP/IP version-6 but the site just doesn't open. What could be the problem?

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  • SQL Server connection error (a weird one) (unsolved yet)

    - by Pinchy
    SQL Server can be connected from local system but can not be connected from remote system in the network. The error code is 40 from Visual Studio and 1326 when I try to connect to SQL Server from Management Studio. Firewall isn't the problem TCP/IP connection is enabled from SQL Server There are 2 pc terminals that can connect to the SQL Server but the 3th one cannot and using the same connection strings so the connection string is right It is SQL server 2000 any help will be appreciated thanks

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  • Access Derby for CDP Server

    - by Skudd
    I am working on a project that requires accessing the Derby database behind a CDP Backup Server. From what limited research I've been able to complete, I have found that it is possible to access Derby databases over TCP, but I'm at a complete loss for this. I'm looking to connect via PHP eventually, but first I need to know if this is at all possible with an out-of-the-box CDP server. Answers are, as always, appreciated. Thanks!

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  • Maximise network transfer speed of various applications

    - by Alex
    When using nc, scp, wget to transfer files between 2 machines on a dedicated 2Mbps link, I get speeds between 0.5 and 1 Mbps. However, when I use iperf -c 10.0.1.4 -t 20 -P 12 (for example) I can maximise the speed of the link (getting stable 2Mbps). Is there a way to make single stream transfers (such as those done by scp) to utilise all/most of the link? Some kind of tcp settings, or iptables...?

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