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• Do two portforward rules translate to "and"?

  - by blsub6

  I just set up an Exchange server to replace my DeskNow mail server. I want to start testing my internet mail exchange of my Exchange server. I can only set the MX records on my DNS up to my one external IP address so I was thinking that I could set up a firewall rule on my internet-facing firewall that port forwarded the smtp packets to two different servers. My question is: If I do that, will that mean that the smtp packets will be forwarded to just the first internal IP on the list? Or does it mean that the packet will be cloned and sent to both IPs?

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• Debian pure-ftpd, Restrict access

  - by durduvakis

  I am running Debian Wheezy, with ISPConfig 3, plus ModSecurity and I would like to restrict access to ftp to specific IP(s) globally (not to specific ftp users only), that can be either 127.0.0.1 or one I would manually add later. I would also like to completely disable ftp access from the web, but allow only from ftp-client software (if that is possible). The idea of closing firewall ports is not what I want. I know I can do this setting some firewall rule though, but that is not what I currently need. I have managed to do this for example on phpmyadmin inside it's .conf file, but unfortunately I cannot find any configuration to alter for pure-ftpd in my system. Restricting web-ftp access maybe possible by adding some rule in apache2 conf, but I am not sure how to write such a rule. Thanks to everyone that can help cheers

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• Bound external Cisco CIGESM ports to a specific BladeServer

  - by Vinícius Ferrão

  We have an IBM BladeCenter with 14 blade servers and one external Cisco CIGESM for Ethernet connectivity. Since this hardware is a little old, we will use it for other services, and we want to run a pfSense instance on one of the blades. It's just an Firewall Appliance, but it needs two network interfaces: one for the WAN and the other one for LAN access. Our architecture works on top of static routes, we don't use NAT, so we got the WAN IP in one interface routing to the another one. The main problem is how to plug the WAN cable in one of the four external ports and make it exclusive to the blade server containing the firewall. And we also need an exit port that goes through a 3COM 4200G switch that makes the internal routing and VLAN separation. Thanks in advance

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• FTP error when doing file transfer

  - by Ernie

  I'm running vsftpd version 3.0.2 over FTPeS, and I'm having a bit of trouble with file transfers. It seems to work fine when I'm on the LAN, but not from an external IP address. I have the control port and data ports open on my server's software firewall and my router's firewall. When I'm using the service from an external IP address, it seems like sometimes a file transfer will complete, but it times out and I always get the client error: "426 Failure writing network stream". I've tried several clients. I'm thinking there is some sort of data sabotage either at the router or some server policy; maybe because I'm using passive ftp? Suggestions?

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• Iptables Allow MYSQL server incoming requests

  - by thompatry

  I am trying to get my new MediaWiki server to allow connections to our MySql Server and right now I cannot get my iptables firewall set up right for this. The rule I am applying is the following iptables -A INPUT -p tcp -d 129.130.155.39 --dport 3306 -j ACCEPT # MySQL But my iptables log is still show that the connections can not be established and is being blocked/denied. Nov 21 09:48:39 hds-it kernel: Firewall Deny: [OUTPUT] IN= OUT=eth1 SRC=129.130.155.210 DST=129.130.155.39 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=29232 DF PROTO=TCP SPT=58862 DPT=3306 SEQ=914529531 ACK=0 WINDOW=14600 RES=0x00 SYN URGP=0 OPT (020405B40402080A03BCF2BC0000000001030307) When I turn off iptables, everything works as it should including editing the wiki database. What am I doing wrong with my rule.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• VPN ipsec tunnel from router to single windows server computer (gateway-to-host)

  - by Chris Miller

  Firstly, is this possible? The situation: 2 different ISP's. One has several servers and a firewall running. The other is limited to only one virtual server with one network card running windows server 2008r2. I need to set up a site-to-site style VPN using IPsec between the firewall of one ISP and the windows host on the other (gateway-to-host). This host has to run a SQL-Server that I can access from the other ISP's servers through the VPN tunnel. It seems looking at the RFC for IPsec that this should be possible using the features of Windows 2008, but I can't get it to work so far... It seems that I can't access any services running on the same computer or IP address used as the tunnel endpoint? Thanks Chris

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• Vista to Vista network visability issue

  - by Sk93

  Hi All, I've got a Vista Business PC and a Vista Business Laptop connected via a virgin media router (Netgear CG2100D) and I cannot get the two machines to see each other correctly over the network. The laptop is connected via wireless, whilst the pc is wired. Both are set to recieve their network settings automatically (DHCP) and both have the windows firewall (the only firewall on either) turned off completely. I can ping each machine fine from one another using the ip addresses, and I can also connect via \. However, connections via \ fail, and I cannot see the machines in the network map. I have tried turning netBIOS to be "always on" on both adapters, but this makes no difference. I've been messing around pretty much for 6 hours now and am getting quite fustrated by this! (my original aim was to get media sharing working, but I've pretty much abandoned that for now). Any ideas?

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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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• 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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• Permission to see the expandable list of ISA Server 2006

  - by Hossein Mobasher

  I am working on ISA Server 2006 in Windows Server. I want to add some policy rules to my server, I followed this link. But It points to In the Microsoft Internet Security and Acceleration Server 2006 management console, expand the array name, and then click the Firewall Policy node. When I open the ISA Server 2006 Management Console, I can not show the expand list, how can I force ISA to show the expandable tree to start Firewall Policy? Could any one please help me to do this ? Note : I have administrator permission for my account. Thanks in advance :)

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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