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• Urgent SSH Local Port Redirection

  - by Salina Odelva

  Hi, everyone. I have a shell account but the admin has restricted ssh access to the server. The server is listening on 0.0.0.0:22 but the firewall blocks any incoming attempts to this port. He says he is doing maintenance but I don't believe him and I need to backup my stuff with ssh. My question is that: Is it possible to do this: Me (Wan IP) <- Hosting Server (tcp/8080) redirects to Hosting Server (tcp/22) I don't want to involve my own linux machine in this and I can only make use of ssh.. Thanks!!

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• On RouterOS, how will transparent proxying (with DNAT) affect reporting of netflows?

  - by Tim

  I have a box running Mikrotik RouterOS, which is set up to do transparent web proxying, as described here. In short, this means that I have a firewall rule for destination NAT causing any port 80 traffic to get redirected to port 8080 on the router, which is received by the Mikrotik local web proxy. The local web proxy then makes the web request on the client's behalf, in this case to a parent web proxy server (which in turn does the real web request). My question is, how will this two-part process get reported in the logging of traffic flow information (netflows)? Looking at the logged information, what I seem to be seeing is this: One flow recorded from client machine (private IP) to remote proxy (8080) Another flow recorded from router to remote proxy (8080) The original request that the client made to port 80 isn't recorded. I want to write code to analyse traffic usage, so I want to be sure I'm not losing information if I discard the latter of these.

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• SQL Server 2008 lincensing question relating to web servers

  - by Matty Brown

  We purchased SQL Server 2008 Standard licences last year under the server + device CAL licencing model. Since our server has 2 physical CPUs and only 46 clients, this option was by far the cheapest. Now we'd like to be able to query a small number of stored procedures from our Windows Server 2003 Web Edition server, which is in a seperate zone on our firewall. I think SQL Server 2008 Web Edition could be an option to us, but is it possible to replicate/mirror stored procedures and tables to such a server and would we be breaking any rules by doing so? Is this a form of multiplexing? Also, would replication/mirroring work both ways, if we were to want to write back data from the web server?

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• mod_proxy failing as forward proxy in simple configuration

  - by Stabledog

  (On Mac OS X 10.6, Apache 2.2.11) Following the oft-repeated googled advice, I've set up mod_proxy on my Mac to act as a forward proxy for http requests. My httpd.conf contains this: <IfModule mod_proxy> ProxyRequests On ProxyVia On <Proxy *> Allow from all </Proxy> (Yes, I realize that's not ideal, but I'm behind a firewall trying to figure out why the thing doesn't work at all) So, when I point my browser's proxy settings to the local server (ip_address:80), here's what happens: I browse to http://www.cnn.com I see via sniffer that this is sent to Apache on the Mac Apache responds with its default home page ("It works!" is all this page says) So... Apache is not doing as expected -- it is not forwarding my browser's request out onto the Internet to cnn. Nothing in the logfile indicates an error or problem, and Apache returns a 200 header to the browser. Clearly there is some very basic configuration step I'm not understanding... but what?

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• cannot access my own computer through My Network Places

  - by vgv8

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• webmin not working on port 10000

  - by Ali

  Hi, I posted a similar question yesterday but can't seem to find that post. I have installed webmin on my server which has SSL and its service is running but I am unable to open it in browser. I thought may be the port is blocked by server's firewall so I entered port 10000 (TCP - inbound) in APF but still no luck. When I use https://localhost:10000 on server to access webmin then it works fine but not remotely. Why is such a simple thing so hard to run? Thanks

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• UFW: force traffic thru OpenVPN tunnel / do not leak any traffic

  - by hotzen

  I have VPN access using OpenVPN and try to create a safe machine that does not leak traffic over non-VPN interfaces. Using the firewall UFW I try to achieve the following: Allow Access from LAN to the machine's web-interface Otherwise only allow Traffic on tun0 (OpenVPN-Tunnel interface when established) Reject (or forward?) any traffic over other interfaces Currently I am using the following rules (sudo ufw status): To Action From -- ------ ---- 192.168.42.11 9999/tcp ALLOW Anywhere # allow web-interface Anywhere on tun0 ALLOW Anywhere # out only thru tun0 Anywhere ALLOW OUT Anywhere on tun0 # in only thru tun0 My problem is that the machine is initially not able to establish the OpenVPN-connection since only tun0 is allowed, which is not yet established (chicken-egg-problem) How do I allow creating the OpenVPN connection and from this point onward force every single packet to go thru the VPN-tunnel?

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• ldap sync with outlook

  - by Dr Casper Black

  I have a task to research the possibilities of LDAP as a centralized Address Book. I have setup a openLDAP on debian 5.07. I managed to search the LDAP contacts from MS Outlook 2007 (with some drawbacks like Outlook cant recognize street and organization fields). My question is, is it possible ,& how, to sync data on LDAP server with applications that support LDAP? I could not find any data on this topic. EDIT: The point is, to have a centralized list of contacts that can be sync with various applications, for instance Outlook, Thunderbird, Phonebook on mobile phones...etc The Question is, Is it possible to transfer (update) data on a client application from LDAP database and viceversa? So not to search LDAP server data, but to download contact that are not available in the client application (Outlook) and upload data to LDAP if the contact is in (Outlook) and not in LDAP database and the other way around, in other words synchronize.

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• multiple vlans routed on one nic? trunk?General? or Access?

  - by Aceth

  ok for the last week I've tried racking my head around this... I have a SRW208P with 802.1q support, and a virtual endian appliance. I would like to be able to have 3 vlans having everything routed through the endian appliance.. i.e. The Virtual server has 2 bridged NIC's to the switch. This is where I'm getting confused .. On the 8 port switch I've got the 3 vlans set up ok (all being untagged as they are not going to be vlan aware), it's the port I'm connecting the endian firewall to the switch I'm having trouble with (second nic goes to the adsl modem and NAT'd) Is it meant to be a trunk, "Genereal" or "Access" then untagged or tagged? the end goal is to have vlan traffic routing through the single NIC and have endian route vlan traffic according to the rules. Any one have any ideas on the cisco small business stuff? Thanks

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• In TCP/IP terms, how does a download speed limiter in an office work?

  - by TessellatingHeckler

  Assume an office of people, they want to limit HTTP downloads to a max of 40% bandwidth of their internet connection speed so that it doesn't block other traffic. We say "it's not supported in your firewall", and they say the inevitable line "we used to be able to do it with our Netgear/DLink/DrayTek". Thinking about it, a download is like this: HTTP GET request Server sends file data as TCP packets Client acknowledges receipt of TCP packets Repeat until download finished. The speed is determined by how fast the server sends data to you, and how fast you acknowledge it. So, to limit download speed, you have two choices: 1) Instruct the server to send data to you more slowly - and I don't think there's any protocol feature to request that in TCP or HTTP. 2) Acknowledge packets more slowly by limiting your upload speed, and also ruin your upload speed. How do devices do this limiting? Is there a standard way?

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• Can't add printer on Windows XP

  - by SuperFurryToad

  I've added a HP 4250 printer to about half a dozen Windows XP PCs in our office without any problems whatsoever, but for some reason I haven't been able to add it to one particular PC today. I go through the Add Printer wizard to add a local printer attached to the PC, enter the new port number as a Standard TCP/IP Port, install the driver. At the end of the wizard I get the following error message: Full error message: "windows cannot connect to the printer. either the printer name was typed incorrectly, or the specified printer has lost its connection to the server." This doesn't make any sense as I am able to ping the printer from the PC. The print spooler is running, and any firewall software on the local PC is switched off.

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• How to upgrade a single instance's size without downtime

  - by Justin Meltzer

  I'm afraid there may not be a way to do this since we're not load balancing, but I'd like to know if there is any way to upgrade an EC2 EBS backed instance to a larger size without downtime. First of all, we have everything on one instance: both our app and our database (mongodb). This is along the lines i'm thinking: I know you can create snapshots of your EBS and an AMI of your instance. We already have an AMI and we create hourly snapshots. If I spin up a new separate instance of a larger size and then implement (not sure what the right term is here) the snapshots so that our database is up to date, then I could switch the A record of our domain from the old ip address to the new one. However, I'm afraid that after copying over the data from the snapshot, by the time it takes to change the A record and have that change propagate, the data could potentially be stale. Is there a way to prevent this, and is there a better way to do this than I am suggesting?

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• sql server 2005

  - by NIKS

  How to create database in sql server 2005. How to start with sql server 2005.

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• CA and VPN setup

  - by Raj

  We are a small comany about 20 employees. We have some off site some i houser servers. Where should I install CA? On a domain controller or VM? can I obtain my own certificate for MS VPN? Where should I install MS vpn server? can I install on VM CA server? Do I need to open any ports on Firewall? Please send me or direct me to a web site where I can get setip by step installation instructions. Thanks.

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• Virus blocking incoming connections ?

  - by Benoît

  Hello, on my windows 2003 server, all incoming connections are dropped. I can see them getting in using Wireshark, but even a single ping from another computer fails. All locally initiated connection work fine (i'm asking from the server). This server is the DC/DHCP/DNS/File server, so computer clients are in the dark. I've run varius antivirus and removal tools without any luck. The Windows Firewall is disabled. I'm wild-guessing at some virus/worm. How can i check why these incoming ICMP/TCP SYN/etc are dropped ? Anyone has any knowledge about such situations ? Thanks.

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• FTP error 424 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• NLB RPC server is unavailable on the specified computer

  - by Robin Weston

  Hi guys, Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server 2008 Web Servers. Neither of the machines are members of a domain, and both have 2 NICs (one for processing external web traffic, and one for communicating internally). I have installed NLB on both machines, and have created a cluster on Host A and added itself to it. However, when I try and add Host B (using the address from the external NIC) I get the following error : "The RPC server is unavailable on the specified computer". On Host B I can see that the RPC service is running fine. I can also ping and RDP from Host A to Host B with no problems either. I have disabled the windows firewall on both machines but that had no effect

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• How to get two seperate remote domain controllers with same IP to work?

  - by Mr. Mister

  Hi, I have a VPN setup between multiple locations. Between each location and the central point (me), is a trust between our domain controllers. It all works great.. A new location wants to join, but their AD controller is using an IP address that is already in use by another AD in a separate location. Neither locations can change their IP addresses, but apparently there is a NAT rule that could be used to allow communication between each AD controller? The central site has a Cisco 5510 firewall which could perform the NAT, but I am unsure of the logic behind the NAT rule. Is anyone able to explain or help out? Thanks.

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• multiple file systems for mysql

  - by RainDoctor

  Does mysql support multiple file systems for a single database with most of the tables being on MyISAM? Context: we have a 1.5TB mysql database, which is increasing at the rate of 200GB per month. The storage is directly attached, whose slots are almost full. I can add another DAS, and increase the file system. But resizing volume, resizing file system, etc are getting messy. Is there a concept of "tablespace, datafile" (like in oracle) in MySql world? Or how you guys manage mysql db with these kind of constraints?

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• Backup SQL Server directly to CD-RW?

  - by Aidan Ryan

  Is it possible to backup a SQL Server database directly to CD-RW?

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• Unable to connect my computer from LAN (http, smb) in UBUNTU 10.04

  - by Abdul Majeed

  I installed ubuntu 10.04, Apache, PHP, mysql, smb. Everything work fine in locally in my IP. When i trying to access my computer from LAN (other computer), it shows unable to connect. when i ping my IP from remote computer, its pinging OK. I can access internet, and all other systems (http, smb). But the problem is no one can't access my computer remotely in my LAN network. My ip is 192.168.85.105 and i want access(Appaceh,SMB) from 192.168.85.10. Is there any proxy firewall settings? I had tried following commands.. sudo iptables -F or sudo iptables-restore [logout require] If it does not work then try to disable net-filter sudo ufw --disable Please give me the solution.

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• What is the method to reset the Planar 1910m monitor?

  - by Richard J Foster

  My monitor (a Planar, apparently model number PL1910M) is not working. (It is flashing a green / orange sequence which I believe to be an error code. The sequence, in case it helps consists of orange and green three times quickly followed by a longer orange, then another green followed by a long period where both colors appear to be present). I vaguely recall a co-worker suffering from a similar problem, and our IT department "resetting" the monitor by holding down a certain set of keys as they apply power. Unfortunately, I do not remember what that key sequence was, our IT department is not responding, and the Planar web site is blocked by the content filtering firewall we have in place! What is the sequence to perform the reset? (For bonus geek-credit, what does the code mean... as if it indicates a blown component clearly a reset will not help me. ;-))

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• Forwarding ports with ssh on Linux

  - by Patrick Klingemann

  I have a database server, let's call it: dbserver I have a web server with access to my dbserver, let's call it: webserver I have a development machine that I'd like to use to access a database on dbserver, let's call it: dev dbserver has a firewall rule set to allow TCP requests from webserver to dbserver:1433 I'd like to set up a tunnel from dev:1433 to dbserver:1433, so all requests to 1433 on dev are passed along to dbserver:1433 My sshd_config on webserver has the following rules set: AllowTcpForwarding yes GatewayPorts yes This is what I've tried: ssh -v -L localhost:1433:dbserver:1433 webserver In another terminal: telnet localhost 1433 Results in: Trying ::1... Connected to localhost. Escape character is '^]'. Connection closed by foreign host. Any idea what I'm doing wrong here? Thanks in advance!

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• Is there an apache module to slow down site scans?

  - by florin

  I am administering a few web servers. Each night, random hosts from the Internet are probing them for various vulnerabilities in php, phpadmin, horde, mysqladmin, etc. Is there a way (apache plugin?) to slow down the rate of attack? For SSH, I have a rate limiting rule on the firewall, which does not allow more than three connections per minute. But I don't want to rate limit all HTTP access, only the access that returns 404s. Is there such an apache module?

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• Exchange Server Contact Categories - How to Remove/Update All

  - by ben

  I've been tasked with cleaning up our companies contact database sitting on our Exchange Server 2003. The rub is this database of contacts has been neglected for the past couple of years and is now a bit messy. My issue is I have say a person named 'Bob Smith', and Bob is listed in multiple categories, 'Students' and 'Student'. I would really like to remove the 'Student' category from Bob and anyone else out there that has the same category. My question is, is there an easy way to edit the master category lists for contacts on the exchange server? I feel like I am missing something simple here since if I were playing with the categories that I use, to say organize email its very easy to do so, but I can't seem to find the proper way to do it for categories that are up on the server. I'm attempting to work through Outlook 2007 and Exchange 2003. Any insight would be very helpful as I really don't want to change 8000+ contacts by hand.

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