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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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• rsyslog server - Can you split up and organize logs?

  - by Jakobud

  I recently setup one of our servers as an rsyslog server. I now have our firewall setup to log everything to that rsyslog server. But there doesn't seem to be an organization of the logs. All the firewall logs are just being dumped into the /var/log/messages on the rsyslog server. I guess I was maybe expecting them to at least be in a machine specific log file or directory. How can I organize the incoming logging? If I setup 20 servers to all log everything to a central rsyslog server, I really don't want everything being dumped into one big file or a few files. How can I setup rsyslog to tell it where to log what? Like if all the logs for a specific server were in it's own directory/file, etc... Is this possible?

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• Filtering attachment types in Google Apps (free Google Business)

  - by Ernest

  We have Google apps in our company for mail delivery, our business can't pay the business version yet, however, we need to control the attachment types that employees download. We recently switched from another hosting provider who recomended us to plug Google Apps for mail when we moved the domain, we had a firewall before which was able to prevent certain file types to be downloaded. I know the business version has section for filtering mail (postini services). Is there a hack around my problem? Anyone ever had this problem? Thank you! UPDATE: The main problem is gmail apps uses ssl connection, can this be changed ? how can i get the firewall to filter files only allowing *.doc, *.xls y *.pdf.

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• MSDTC Port 135 open bi-directionally

  - by Stephen Lacy

  I have two servers, a web application server and an SQL Server database running on its own server. I have a firewall between these two servers. Do I have to open port 135 on both the SQL Server and the Web Application Server. Does the SQL Server open its own connection to the Web Application Server on port 135 or any other port? Do I have to in component services point the Web Application Server MSDTC at the SQL Database Server? If the firewall is completely open, the settings in component services set to allow remote connections, remote administration etc is there any other settings that need to be changed in order to allow remote connections to the SQL Server MSDTC?

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• Only ONE Outlook 2010 installation "Cannot connect to Exchange server" when setting up new profile.

  - by Johnny PDEX

  Exchange 2010, one-server installation (small production, I know not best practice) OWA Connectivity has been confirmed, Autodiscover is configured and working properly for EVERY other installation. Other user accounts tested on problem Outlook, none can connect. Windows Firewall is pre-configured by Group Policy, only modifications being related to remote management. Firewall has also been disabled during diagnostic period. Network discovery and file sharing is enabled on workstation as well. Windows 7 Professional, latest updates installed. Driving me nuts. Help, serverfault?

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• How two use 2 subnets on one network

  - by BGuy2010

  I have some servers at a colocation. They've given us an IP range,subnet,and gateway. Now we have run out of IP's and they've given us a new range of IP's but with a different subnet and gateway. We have a Juniper NetScreen firewall and a load balancer, and I am not sure how to proceed in order to be able to use these new IPS that are on a different subnet. Do I need to setup a new VLAN? on our firewall? I tried adding one of the new IP's on one of our servers, with the new subnet and gateway. I could ping the alternate gateway, but could not ping the assigned IP from outside or from inside.

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• Cannot connect to IIS 7 from localhost

  - by Wout

  I cannot connect to the local IIS 7 using "http://localhost" in IE. "http://127.0.0.1" doesn't work either. The strange thing is that if I add a binding on e.g. port 81, then I can reach "http://localhost:81". Also turning off the firewall on the local machine doesn't help. The site is reachable from the internet. The local requests don't seem to hit IIS (no entries in the IIS log files). IIS is hosted on Windows Server 2008 R2 from behind a hardware firewall device. Note that I'm a programmer, not a network administrator, so I'm having a hard time trouble shooting this.

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• linux intrusion detection software

  - by Sam Hammamy

  I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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• Can only connect to sql server express 2012 via named pipes

  - by YetAnotherDeveloper

  I have sql server express 2012 installed on windows 2008, locally everything works just fine i can connect via tcpip and named pipes. Remotely i can connect with ssms only using named pipes. I have tried disabling the firewall on both sides to eliminate blocking traffic. i have toggled the tcpip setting on and off (i read somewhere that they got it working just but flipping them off and back on). I have double/triple checked all the settings that i'm aware of and everything seems to be correct. Tcp is enabled Tcp port is set to 1433, udp port is set to 1434 Server has static ip Start up log says: Server is listening on [ 'any' 1433]. Firewall rules are in place Any suggestions on things that i can look into? i have really just run out of ideas.

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• Can I associate my spare Elastic IP addresses to an Amazon EC2 instance started in an Autoscale group and Monitoring?

  - by undefined

  I want to know if I can reserve a number of Amazon Elastic IP addresses and assign them to instances started by Autoscale. So basically, when a new instance is started because a trigger has been triggered can I also set the API to look for a spare IP address and allocate it to the instance. I need to do this because the started instance will need to communicate to a server outside the cloud and get through a firewall which will only allow remote access from a predefined set of IP addresses. So i think i need to reserve some IPs, add them to my firewall settings then allocate them (automatically) when a new instance is started. Any ideas?

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• sql user not associated with a trusted connection

  - by homestead

  just setup a new server with sql server express 2005. (want to connect remotely) I set logins both windows and sql I modified so both local and remote connections are allowed I restarted the server windows firewall is not connected. (have an external firewall with a hole at port 1443) user account is active, no password policy or forcing to change on next login etc. If I even try to connect using this username locally on the server using 'file | connect to object explorer' I get the same message that the user is not associated to a trusted connection.

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• Where might I be having problems with making web server acessable (XAMPP)

  - by Erx

  I've installed XAMPP and it seems to be working - sort of. It will serve pages if I access it via http://localhost or 127.0.0.1 but not if I use the actual IP address I have. I thought it might be a firewall issue, so I turned off the firewall and the issue still remains. I don't have enough experience to know where to look next, so I thought I might get some advice here. Running on Vista. The error I'm actually getting it "Timed Out". I've had XAMPP running on this machine prior, but I've had to reinstall my OS/new hard drive ... and I can't seem to get it working.

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• Windows 7 RDP Problem - connecting to external zone with computer names

  - by alex

  I recently installed Windows 7, all is well so far, apart from using RDP to access computers outside my domain. We use a datacenter, outside of our domain. I was using Windows Vista before (not sure if this is relevant) - I could RDP no problem to the machines (using their machine names - Web10 for example) I have changed my IP address to be the same as it was when i was using vista We use a draytek firewall - we use DMZ Host to map my IP to an external ip- which is allowed to access the datacenter I've disabled windows firewall When i try to connect in Remote Desktop client, using Web10, I can't connect, however, if I enter the actual IP address, i can. I have run out of ideas... any help is appreciated!

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• Is it necessary to have firewalls rules between trusted nodes communicating on their backend interfaces?

  - by Tom

  I have 6 nodes that have internet access on eth1 and private access to one another on eth0. Currently I have firewall rules for eth0, for things like memcached and NFS. Is this necessary? It's a real headache as NFS for example communicates on loads of different ports, and I recently introduced glusterfs which needs more still. Is the headache of figuring out what backend ports to unblock worth the security enhancement? I should mention that I will of course still have a firewall rule on eth0 to block servers owned by others in the same datacenter. Thanks

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• JBoss behind NAT hostname problem

  - by z0mbix

  My company has a JBoss cluster sitting behind a firewall that performs NAT. We forward ports to JBoss from the firewall, so that our client application can access the server. We are having trouble when JBoss replies it tells the clients to connect to the internal hostname, not the external one with which the initial connection was made. Is this something that is easily resolved/configured? How are other JBoss app servers configured behind NAT firewalls? Split-horizon DNS? Many Thanks

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• telnet: Could not open connection to the host, on port 23

  - by Mihaela

  I need to telnet, to localhost. I am on windows. Once I got the error 'telnet is not recognized...' I looked online and found that I should do pkgmgr /iu:"TelnetClient". I did, then telnet localhost (0r 127.0.0.1, maybe with a port at the end), I get error: Could not open connection to the host, on port 23: Connect failed. I added the port to the firewall, disabled the firewall.. run as admin.. Please help me get telnet to work! Thank you.

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• Windows 2008 R2 Not resolving IP's or domains

  - by InsaneAR

  I have two servers with Microsoft Windows Server 2008 R2 x64, and today I realized that one of them don't resolve IP's or domain names. If I ping the same machine IP, it respond, but if I ping an external IP (like 8.8.8.8 or any other) it does not work. The same with domain names. At Windows Event Viewer I'm having Warning 1014: Name resolution for the name timed out after none of the configured DNS servers responded THE SERVER HAS CONNECTIVITY, I'm connected remotely and the services and incoming traffic (like FTP, etc) are working OK. Things I've done & tested: Run Kaspersky Virus Removal 10 Restart/Turn off the DNS Client service Clean the hosts file Reboot the server Turn off the Windows Firewall (there's not another firewall) Quit or replace the current DNS servers I just can ping the same machine IP or the gateway! Can anybody help me?

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• Where does traffic shaping typically take place?

  - by eekmeter

  As part of upgrading our network infrastructure we are looking to traffic shape our bandwidth since we only have about 3Mb down / 1 Mb up. We're looking to prioritize it so that web browsing gets priority and in the future some VOIP might be added in as well. Internal LAN traffic doesn't need to be controlled just our outbound connection. I've been looking at Cisco hardware and it seems that several of their products do shaping at the core switch, firewall, and router level. I'm wondering where does shaping normally take place? Is it normally done at the router, core switch, or firewall?

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• Proxy Server suggestions

  - by Jon Menefee

  Here is the question I have that hopefully is not too general of a question. I have a network with approximately 25 PC's, 3 servers and 25 IP cameras. I have a firewall already on the network and it works fine for what I need, but my client is asking me if there is a way to put a Proxy server on the network to monitor where his employees are going when they surf the Internet. He is not wanting to block them (at least not thru the Proxy server), but he wants to make sure that they arent going to sites that would compromise the networked PCs. I have looked at TMG and it is a little more than what I want. I hesitate adding another firewall to the system because of the security cameras that are presently on the network (IP Cameras). I just want to put a policy in AD that would make certain Users (or Computers) use a Proxy server. Any suggestions on a good proxy server are welcome. Thank you

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• Windows Virtual Machine ping reply fails the first few times

  - by user28471

  I am running a windows Web Server 2008 virtual machine. When I try to ping it from another windows machine the ping reply comes straight back with 100% success. But when I try to ping it from one of the Linux boxes, the ping reply fails with partial or 100% loss the first couple of time and succeeds the third time onwards. I know it is quite strange but can any one think anything that could be causing it. Could anything in the Windows Domain Security or Firewall be "taking time" to allow responding to the ping request? In fact even the firewall is turned off on the virtual machine.

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• What special configuration is needed to have a domain controller with DNS on a VM in Hyper-V?

  - by Michael J. Gray

  I have a server running Windows Server 2012 and it only has the Hyper-V role. I have a VM also running Windows Server 2012 and it has the Active Directory: Directory Services and DNS ([example.com]) roles. It has been promoted to a domain controller for [example.com]. In the virtualization host I have joined the domain successfully. On a laptop on the network, it can ping my DNS that is inside the VM on the virtualization host. However, it can't resolve anything through the DNS. I figured it was a firewall issue where the DNS had the firewall allow rule, but the virtualization host did not. I added that, but it didn't fix the issue. On my laptop, I get "UnKnown can't find [example.com]: No response from server" immediately. There's no time out, it just comes back right away. What have I overlooked?

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• Multiple Session using port 1081 in one box using SSH

  - by regmaster

  Hi Guru's, I am setting Linux Hopping Station to another different servers. My current config to connect to another servers is using different port to connect. e.g ssh -D 1080 -p 22 [email protected] ssh -D 1081 -p 22 [email protected] Now what I would like to have to share the same port from the same box. ssh -D 1080 -p 22 [email protected] ssh -D 1080 -p 22 [email protected] But when I share it, I will get below error: bind: Address already in use channel_setup_fwd_listener: cannot listen to port: 1080 Could not request local forwarding. How could I configure the same port? help. thank you. I want to share the same port because this is needed when configuring firewall in Citrix Firewall on other machine, not needed to many many ports and keep changing when changing connection. thank you.

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• Disabling certain JBoss ports

  - by Rich

  We are trying to configure JBoss 5.1.0 to be as lightweight and as secure as possible. One of the parts of this process is to identify and close any ports we do not need. Three ports that we have outstanding but don't believe we need are: 4457 - bisocket 4712 - JBossTS Recovery Manager 4713 - JBossTS Transaction Status Manager We don't think we need any of these features (but could be wrong). Bisocket seems to be a way for JMS clients behind a firewall to communicate with JBoss. We hardly use JMS now and when we do, it is very unlikely that we will need this firewall traversing ability. I am less sure about whether we need the two JBossTS ports - I am guessing these are used in a clustered environment - we aren't clustered. So my question is, how do we disable these ports (and associated processes where possible), or if we need these ports, why do we need to keep them open?

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• Forwarding requests throught Apache to openVPN

  - by Ency

  I am wondering if it is possible to redirect requests through Apache to eg. OpenVPN. As long as I need to bypass firewall, I need to use port 80/443 for openVPN, but there is Apache server which has both port for itself. Client ---> Firewall (allows 80/443 only) --->| ---> Apache (80/443) ---> OpenVPN (1194) | -------------------------------------------- My Server I was thinking about mod_proxy, but I am not sure if it is good idea, have you got any ideas? I hope possible solution will be applicable on virtual host as well.

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• Is there a way to expose ports when the three default firewalls were disabled

  - by Nactus

  I think I disabled the three firewalls that come with FreeBSD (just for experimentation purposes). I checked the modules that load with the kernel (using "kldstat"). The only modules that load are: kernel -- ng_socket.ko, netgraph.ko, ng_mppc.ko and rc4.ko). I'd like to know what module is still blocking my ports now. After removing all firewall options from the rc.file and re-compiling the kernel without the pf option (or any firewall for that matter), I can't still open ports freely. How does it work exactly? Thanks.

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