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• Have two exchange servers to communicate together

  - by Data-Base

  We have Exchange Server 2007 using our domain ddd.com. We created an isolated network with a firewall/gateway and installed a DC and Exchange Server 2010 using a demo/test domain (ddd.loc). We opened all the needed ports in the firewall (10.10.2.88) to the Exchange Server 2010. In our main Domain Controller (10.10.2.3) we defined the domain ddd.loc with IP 10.10.2.88 (firewalls). We also we defined MX records to the same IP (10.10.2.88) We did that so when we send email from my email [email protected] it will go to the Exchange Server 2010. Anyways, all the pings test from to any servers are OK. But we are not able to send or receive emails. Between these Exchange Servers we can not send any email from the 2010 to any email in general (emails are pending). Also, in Exchange 2007 we are getting error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

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• Ubuntu based VPN server behind NAT router?

  - by maartenn88

  I have a small intranet- and file-server inside our company, which can only be reached from inside our own network. I'd like to be able to reach the intranet and files on the server from outside the network, however I don't really like the idea of completely opening security by forwarding the ports on our NAT-router, so I'd prefer to enable a VPN possibility for this. So I have a router, which is the DHCP server and has NAT function, and I have an Ubuntu Server with the files and intranet on it. How do I configure these two so that I can make a VPN connection with my network in order to reach the server? thanks in advance for any answer!

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• port forwarding using 3 static ip addresses

  - by Danny

  I am new to configuring routers. We have purchased a RV016 Cisco business router that has multiwan capability. What we are attempting to do is take map services from 3 different servers and assign 3 different static IP addresses and then forward port 80 through the router. A short term solution to building a proxy server. Is this possible? Right now we have a consumer grade Cisco router and assign a static IP and it works, we attempted the same settings on the business router and cannot get to the internet. We set it DHCP and it works fine, however we want to to forward the static ports not use DHCP.

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• Exchange Server 2010 does not include WebDAV

  - by CNLSH

  This is the 1st time I'm dealing with server. May I know what does it mean by "Exchange Server 2010 does not include WebDAV"? Does this mean that EWS does not use HTTPWebRequest and HTTPWebResponse anymore or does not communicates by using the same ports that HTTP and HTTPS? Is it some setting done at the server side that disable the use of WebDav? When it said does not include WebDAV, what does it actually mean? If i really want to use WebDav in Exchange Server 2010, is it possible? Yes, EWS is way better compared to WebDav but what if I wish to use WebDav.

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• Cannot connect to FTP server from external host

  - by h3

  I have a FTP server (vsftpd) setuped on a Linux box (Ubuntu server). When I try to connect with a computer on the same network everything works fine as expected. But as soon the IP is external it won't connect.. I first assumed the port was blocked, but then: localserver:$ sudo tail -f /var/log/vsftpd.log Wed Jan 13 14:21:17 2010 [pid 2407] CONNECT: Client "xxx.xxx.107.4" remotemachine:$ netcat svn-motion.no-ip.biz 21 220 FTP Server And it hangs there .. Is there any other ports other than 21 that are required to be open ?

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• Cisco Router 1921

  - by mytempfw

  I'm very new in networking and I'm trying to setup my network as follow [ISP Modem/Router/Switch] + --- + {fxp0} [Linux Firewall] {fxp1} + --- + {??} [Cisco Router 1921] {GE 0/0} + --- + [Cisco Switch] + ... Servers {GE 0/1} + --- + [Cisco Switch] + ... Servers My questions are, Since I'm using both GE 0/0 and GE 0/1 ports to connect to switch, how can I connect my Linux Firewall (Port fxp1) to my Cisco Router? I know the USB and Console port are for configuration, can I use AUX port to connect my firewall (if so is it consider a right way)? Is my setup is right? if not can someone please explain to me to do the setup in right way. Link to the picture of my router: Cisco Router 1921 Thanks

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• Problem running application on windows server 2008 instance using amazon ec2 service and WAMP

  - by Siddharth

  I have a basic (small type) windows server 2008 instance running on amazon ec2. I've installed WAMP server on to it, and have also loaded my application. I did this using Remote desktop Connection from my windows machine. I'm able to run my application locally on the instance, however when I try to access it using the public DNS given to it by amazon, from my browser, I'm unable to do so. My instance has a security group that is configured to allow HTTP, HTTPS, RDP, SSH and SMTP requests on different ports. In fact I have the exact same security group as the one used in this blog, http://howto.opml.org/dave/ec2/ I did almost everything same as the blog, except for using a different Amazon Machine Image. This is my first time using amazon ec2, and i can't figure out what I'm doing wrong here

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• Restrict VPN Clients to VPN Server

  - by Sprotty

  I've setup a VPN server using Debians pptpd. This all works, but I want to restrict incoming connections so they can only access ports on the VPN server and not get access to other machines on the VPN servers local network. I'm guessing this is a firewall rule? but i'm new to linux so am struggling a bit... ---- Additional info ----- The VPN Server is also hosting an SVN server, which is its real purpose, and the only service I want it to expose to incoming connections. I guess I could expose the SVN server directly, but I'm not confident that I could secure this correctly, so a VPN seemed to give an additional layer of security.

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• Mini DV and DVI Conversion

  - by Kairan

  Video card is: AMD HD 6950 My video card comes with 1xHDMI, 2xDVI, and 2xMini DV ports. I have always used VGA and DVI only. I have the HDMI already connected. I want to hook up 2 more display. One of the display can take a VGA only, the other is an LCD TV so it has VGA, HDMI, Component. I am wondering: 1) What is the best output port to use for the second two monitors? The miniDV or the DVI? 2) I need to run a long cable maybe 15-25 feet, this might change the answer to question 1, is an HDMI long cable 20+ ft going to be better than a 20ft DVI or miniDV ?

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• PDAnet on Android IP on PC is not public IP. Where does the NAT take place, PDAnet or Verizon?

  - by lcbrevard

  When using PDAnet on a PC (Win7 ultimate) to USB tether a Motorola Droid on Verizon 3G the IP address of the PC appears to be public - 64.245.171.115 (64-245-171-115.pools.spcsdns.net) - but connections show as coming from another public IP - 97.14.69.212 (212-sub-97.14.69.myvzw.com). Someone is performing Network Address Translation - either PDAnet or within the Verizon 3G network. Can someone tell me who is doing the NAT? Is it PDAnet or is it at Verizon? Is there any possibility of setting up port forwarding, such that connections to the public IP 97.14.69.212 (212-sub-97.14.69.myvzw.com) are forward to the PC? We are testing a network protocol that requires either a true public IP or forwarding a range of ports from the public Internet to the system on which the software runs (actually Linux hosted by VMware Player or Workstation on a PC running Windows).

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• Remote connection to dynamic public ip & private ip addresses

  - by user51737

  Many times I connected to windows computer which has static public ip address via remote desktop over wan links. I'm wondering how could I connect to the remote computer that has dynamic public ip address & private ip addresses assigned. I've 2 systems at home: xp system-------connected to internet(dynamic public ip) & allowed other users to connected to the internet on the interface. windows vista system--------enabled dhcp on the interface to access internet from xp. How could I remotely connect from my office to the 'vista system'?. If I've a router/modem at my home it may be possible to allow the ports for the system but I don't. Any tips?

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• Azure VM : Connection refused by host

  - by Simon Kérouack

  I recently stopped a subscription with 14 VMs in it and restarted it a few days later. Now all my VMs are working just fine at the exception of 6 used for MongoDB. They respond to ping and so they show as online in the azure dashboard but they do not answer to anything else. I tried (from different locations, in and out of the azure cloud) ssh : connect to host * port *: Connection refused telnet : Unable to connect to remote host: Connection refused mongo : exception: connect failed The ports for ssh and mongo are opened in azure. I tried restarting the VMs a few times trough the azure dashboard, they seem to restart successfully but still refuse all connections. I already looked for similar issues and the best solutions I found was to wait... the issue has been happening for 7 days and waiting is no more an option.

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• Setting up the metasploitable in virtualbox

  - by SetSlapShot

  I'm supposed to try and use kali to do exploits on metasploitable, but I'll burn that bridge when I get there. My question right now is: How do I set up a host only network on virtualbox? I heard that it was unsafe to run metasploitable in bridged networking mode, that host only or NAT is better. When I run metasploitable on NAT, the kali box (attacker) has the same ip address as the metasploitable box, and nmap doesn't really return anything except what I can only assume would be a scan of its own ports? I tried to create a host only network in virtual box. I left the adapter settings at the default, and unchecked DHCP server. now when I run ifconfig on the metasploitable box, there is no ip address listed. Am I setting up/connecting to/not configuring the host only network correctly?

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• Prevalence of WMI enabled in real Windows Server networks

  - by TripleAntigen

  Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that could benefit from the features of WMI, but I noted after creating a virtual network based on Server 2008 R2, that WMI seems to be disabled by default. Do systems admins in practical corporate networks enable WMI? Or is it usually disabled for security purposes? What is it used for if it is enabled? Thanks for any advice! MORE INFO: I should have said, I really need to be able to query the workstations but I understand that by default the WMI ports on Win7 and XP firewalls (at least) are disallowed, so do you use some sort of group policy or other method to leave a hole open for WMI on the workstations? Or is just the servers that are of interest? Thanks for the responses!!

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• HTTP, HTTPS and FTP is not working but SMTP and IMAP are working.

  - by nWorx

  Yesterday on a computer of a friend a strange thing happened. after booting the ports fo http, https and ftp are closed but e-mail is still working. in the control panel the windows firewall seems active even if he tries to deactivate it. I have a suspision that it is the faul of norton internet security 2010, we have tried to uninstall it, but the uninstallation did not work. when using the removal tool from symantec it just goes to 23% and then it crashes. the process ccSvcHst.exe is still running. How can I safely remove the rest of Norton Internet Security? Edit: Norton Internet Security 2010 is sucesfully removed, but still no connectivity...

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• FreePBX: Asterisk in the Cloud (EC2) Audio Problems

  - by neezer

  Please pardon the newbie question, but I can't seem to figure this out. I followed the Voxilla's tut to the tee: http://voxilla.com/2009/10/15/voxill...p-by-step-1457 But in making calls, my softphones connect, yet no audio (in either direction). I know from poking around the forums that this is generally caused by two factors: NAT and audio codecs. I (being new to the arena), however, don't know which. I believe I have Asterisk and the clients restricted to just ulaw, and I also believe I have the correct ports open, and my externip set correctly (I think the Voxilla AMI does this automatically, since it's in the cloud). I'm a bit lost. I'd be happy to post whatever configuration files that might help, provided you tell me where they are on the filesystem. But like I said before, this is effectively a vanilla install of Voxilla's own FreePBX AMI. I'd appreciate any help or guidance here. Thanks!

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• Setting up Mac VPN on simple network with separate IPs

  - by Dave

  Hi there, We have a pretty simple network configuration. A typical ASDL line with two extra IP addresses. We have a basic home network router Dlink DIR-655. We have two Mac OS X Snow Leopard Servers that we want to setup VPN on. The problem is that we can't change the ports which VPN works under ie. we can only setup port forwarding for UDP 500,1701,4500 to a single server. I'm wondering how we can cost effectively re-work our network so that we can take advantage of the separate IP addresses and have both VPNs working with the same router. Is that possible with our current hardware setup or do we need something more powerful? We're also toying with Mobile Access and wondering if that might be easier to setup. Expert help is greatly appreciated.

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• Network with bridge and port forwarding?

  - by rafek

  Hi! Below is my current (and planned) home network configuration. I would like to connect my non-wifi-capable desktop to my home network. The question is: HOW? What device do I need? The primary requiremen is that I need to be able to forward ports to my desktop. How would I achieve this? Is there something like "double port forwarding"? Could anyone please explain this configuration to me? Thank you in advance!

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• What constitutes valid justification for more IP addresses?

  - by David

  I host a small website with a well known VPS service. They provided me with one IPv4 address upon registering and said additional addresses would require justification. I requested one additional IPv4 address so as to have one for a production environment and one for a testing/QA environment. They said this was unnecessary as I could just use alternative TCP ports for the test environment. I can live with using a non-standard port for non-production hosting, but it got me thinking, what would be valid justification? (I asked them and they didn't want to answer). Is there an industry standard for what counts as "valid" justification for additional IPv4 addresses?

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• Cloud services can't be reached from complex customer infrastructure

  - by Nock

  We have several services running on a cloud, they all are hosted on Windows Server 2012 R2, have public IP address and specific port. Some of our customers can't reach them because for "some reason" the ports are cut between a firewall between them and us. (some customers are using a shared internet connection in a multi tenant office and they can't change firewall communication) Well, you get it, we don't have the possibility to make all the firewall "allowing" the communication. My customers all runs Windows 7 at least. What is the best counter solution in such case, using Microsoft (Windows Server) technologies? The best would be some kind of tunneling communication or VPN, but the customer should also be able to access his/her enterprise resources. Bby the way, today we using IPSec using Windows Firewall to secure the communication, is IPSec tunneling a solution for us? Otherwise, is there a service in Windows to enable some kind of VPN between a client and a server but only for a given set of servers?

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• No display but video card fans spins

  - by Marc

  Since I moved my computer there's no display when I plug my screen in the video card but works fine in the mother board. I tried reseting the cmos, but I still have the same problem. The fans are spining and there's a light from the card. I tried the DVI ports and the HDMI Here's my build. I have it for 2 months and everything was working fine. Do you think it's the video card? Asus p8z68-v pro gen3 Intel i7 2600k 120 GB OCZ Agility 3 16 GB RAM Blue Corsair DDR3 Asus GTX 570 H80 Corsair liquid cooling XFX PRO750W 80Plus bronze power supply EDIT That's why And I can't push more cause the card is on this Thank you everyone! I fixed it by pushing the mobo from the other side of the case and now it fits.

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• FreePBX: Asterisk in the Cloud (EC2) Audio Problems

  - by neezer

  Please pardon the newbie question, but I can't seem to figure this out. I followed the Voxilla's tut to the tee: http://voxilla.com/2009/10/15/voxill...p-by-step-1457 But in making calls, my softphones connect, yet no audio (in either direction). I know from poking around the forums that this is generally caused by two factors: NAT and audio codecs. I (being new to the arena), however, don't know which. I believe I have Asterisk and the clients restricted to just ulaw, and I also believe I have the correct ports open, and my externip set correctly (I think the Voxilla AMI does this automatically, since it's in the cloud). I'm a bit lost. I'd be happy to post whatever configuration files that might help, provided you tell me where they are on the filesystem. But like I said before, this is effectively a vanilla install of Voxilla's own FreePBX AMI. I'd appreciate any help or guidance here. Thanks!

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• Display Resolution Getting Changed Automatically (sometimes) - Win7x64 - Asus M3A78-EM

  - by kamleshrao

  AMD PC Motherboard - Asus M3A78-EM (installed VGA drivers from Asus website - AMD_VGA_V863200_XPVistaWin7.zip) It has VGA and HDMI inbuilt ports (ATI Radeon HD 3200 Graphics 256MB) VGA is connected to my ViewSonic Monitor. HDMI is connected to LG LCD TV OS - Windows 7 x64 Ultimate Sometimes, when I reboot/start my PC, my ViewSonic display resolution changes and does not show the recommended value(1440x900) in Resolution Settings. The HDMI display works well always. But after multiple reboots/starts, the problem gets fixed automatically and I get back my recommended resolution on ViewSonic display. I am not making any changes to the existing drivers. It sometimes work well, and sometimes doesn't work. Can someone assist me resolving this permanently.

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• Can Ping but Cannot Telnet directly to SQL Server 2012 Cluster Nodes

  - by tresstylez

  We have a monitoring tool (Solarwinds Orion) that needs to connect to a 2-node failover SQL Server Cluster. For reasons outside of our control -- we cannot monitor the CLUSTER IP directly at this time, so we have fallen back to monitoring each cluster node IP directly. This is not working. Upon troubleshooting, we tried to test that the cluster node was listening on the proper (fixed) port by using telnet to the cluster node IP/port -- and the telnet failed. However, telnet'ing to the Cluster IP/Port was SUCCESSFUL! Each node has its own IP. Each node is listening on the identical FIXED port. Each node has Dynamic Ports disabled. Each node can be PINGED successfully from the monitoring tool. Windows Firewall is DISABLED. How can I troubleshoot why I cannot telnet to the listening port on the cluster nodes?

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• Network Block Device (NBD) clients for Windows or similar solutions

  - by przemoc

  Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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