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• vsFTPd and iptables - how to configure them in CentOS 5.5?

  - by Vincenzo

  I've installed vsFTPd in CentOS 5.5, on TWO servers, and added this rule to their iptable-s: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT Looks like this is not enough, since when I'm trying to upload a file from one server to another, I'm getting this result (IP address is masked): # ftp 99.99.99.99 Connected to …com (99.99.99.99). 220 (vsFTPd 2.0.5) Name (99.99.99.99:root): vinny 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 227 Entering Passive Mode (99,99,99,99,107,74) ftp: connect: No route to host I've found a few articles in the net about the second rule I have to add to iptables, but I didn't find the right syntax for it. Could you please help?

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• IPV6 causing issue with DNS

  - by Mike Wells

  I have set up an 'internal' DNS at my work, basically we have ourdomain.com that is for internet, email etc and I have created on one of our linux network servers (debian) a DNS using bind9 with the domain ourdomain.inc. So based on my files below and the symptoms I'm describing; what effect could IPV6 be having on my setup? What can I do to fix this? I assume it is not actually the IPV6 causing the issue, but rather something in my setup. These are the critical (I think) files I have modified: named.conf.local zone "ourdomain.inc" { type master; file "/etc/bind/zones/ourdomain.inc.db"; }; zone "201.168.192.in-addr.arpa" { type master; file "/etc/bind/zones/rev.201.168.192.in-addr.arpa"; }; named.conf.options options { directory "/var/cache/bind"; // If there is a firewall between you and nameservers you want // to talk to, you may need to fix the firewall to allow multiple // ports to talk. See http://www.kb.cert.org/vuls/id/800113 // If your ISP provided one or more IP addresses for stable // nameservers, you probably want to use them as forwarders. // Uncomment the following block, and insert the addresses replacing // the all-0's placeholder. forwarders { 1.2.3.4; //IP of our external DNS provider }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; ourdomain.inc.db $TTL 86400 ourdomain.inc. IN SOA ns1.ipower.com. admin.ourdomain.inc. ( 2006081401 28800 3600 604800 38400 ) serv1 IN A 192.168.201.223 serv2 IN A 192.168.201.220 serv3 IN A 192.168.201.219 ns1.ipower.com. IN A 1.2.3.4 ns2.ipower.com. IN A 1.2.3.5 @ IN NS ns1.ipower.com. @ IN NS ns2.ipower.com. svn IN CNAME serv1 docs IN CNAME serv2 jira IN CNAME serv3 confluence IN CNAME serv3 fisheye IN CNAME serv3 rev.201.168.192.in-addr.arpa $TTL 86400 201.168.192.in-addr.arpa. IN SOA ns1.ipower.com. admin.ourdomain.inc. ( 2006081401; 28800; 604800; 604800; 86400 ) 223 IN PTR serv1 @ IN NS ns1.ipower.com. @ IN NS ns2.ipower.com. named.conf include "/etc/bind/named.conf.options"; include "/etc/bind/named.conf.local"; include "/etc/bind/named.conf.default-zones"; I then made our internal DNS my preferred DNS with the two external DNSs the next in-line. More the most part this seems to work, I can ping svn.ourdomain.inc and it resolves to the correct IP, I can also ping google.com and it also resolves no problem. So all seem good. However, periodically (couple of times a day at least), I loose the ability to ping the svn.domain.inc (and all others defined under the internal DNS). What seem to fix the issue temporarily is to disable IPV6 on the network adapter of the client machine and then re-enable it. Then it works for a bit but will always fail again. System Info Internal DNS Distributor ID: Debian Description: Debian GNU/Linux 6.0.6 (squeeze) Release: 6.0.6 Codename: squeeze Linux 2.6.32-5-686 i686 BIND 9.7.3 PC OS Name: Microsoft Windows 7 Professional OS Version: 6.1.7601 Service Pack 1 Build 7601 System Type: x64-based PC Network Card(s): 2 NIC(s) Installed. [01]: Realtek PCIe GBE Family Controller Connection Name: WORK LAN DHCP Enabled: No IP address(es) [01]: the.ipv4.address [02]: the:ipv6:address The question... So based on my files above and the symptoms I described; what effect could IPV6 be having on my setup? What can I do to fix this? I assume it is not actually the IPV6 causing the issue, but rather something in my setup.

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• My laptop can connect to every wireless network except fios

  - by going crazy

  I have always been able to connect to every wireless router secured or unsecured wep or wpa. I had Fios installed and could not connect. Verizon suggested it was my computer and gave me an outside wirless drive to use, it worked. I got rid of fios and went back to comcast and threw out the drive, but now 2 years later, I am sitting at my friends house haveing the same problem. My tech savy friend told me it is a firewall setting or something in my antivirus software, but I disabled them both and still nothing works........Funny it is only FIOS

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• Cisco 1841 Box and Watchguard XTM21-W

  - by Corey

  I have never set one of these up before and need a little assistance. Right now we have a T1 line coming in from Sprint to a Cisco 1841 and then on to our router. However, when I plug the Cisco 1841 into Port 0 and the router into Port 3 it does not work. In Port 1 I have my management computer plugged in. We have one subnet and this must be easy but I cannot figure out how to make this work. When the firewall is plugged in then I get no internet or network access.

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• Cannot connect to telnet server

  - by BloodPhilia

  So, I can't use telnet to connect to any server but it works fine from a different computer. It just says it can't connect. I tried the following things: Disable firewall and AV protection. (Basically, there was no security feature left online) Telnet is set to "Trusted" in my AV protection. (Kaspersky Internet Security 2011) Using Putty to telnet, but apparently Putty's connection is also inhibited. (Says it can't connect to host) Disabling the telnet client in Control Panel and then re-enabling it. (Windows 7 Ultimate) hosts file is clean. Checked for nasties using MBAM and KIS 2011 as well as going though my HijackThis logs, nothing found. I can connect to the same machines/servers through the web browser, ping, tracert, etc. Only telnet seems to be blocked. Any other thoughts?

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• After installing Windows what should I do first? update or install antivirus?

  - by EApubs

  Normally, after reformating and installing Windows 7, I used to go online and install all the updates, install all the driver updates and then install the anti virus. Because long ago, when I installed the anti virus first, applying windows updates crashed the AV! So, I install it last. Specially 7 sp1 is critical right? But now im having doubts... Going online without an antivirus means I'm vulnerable! (I have a home router which have a small firewall but I'm not sure about it) So, whats the best thing to do? Install the anti virus first or install the updates first?

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• once VPNed into pfSense, unable to hit the public URLs of my websites - they are routed to the pfSense box

  - by Sean

  I have a pfSense box setup as the firewall/router/VPN appliance at my colo. Once I VPN into the colo (either pptp or openvpn, pptp preferred due to multiple clients and ease of configuration), I am able to hit all my servers by their private 10.10.10.x ip and am able to browse the public internet without issue. When I try and hit the URL of a domain hosted by one of my servers, I am prompted for credentials. If I login using the pfSense credentials, I'm connected to pfSense as if I'd used it's internal IP. If I hack my hosts file to point url - server private IP it works fine, but this is obviously not a good solution. To recap: not connected to VPN - www.myurl.com works connected to VPN - www.myurl.com never makes it to the correct server, but is sent only to the pfSense box I'm sure it's something small that I've missed in the pfSense config.

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• Putting a Windows DC, Exchange in a DMZ

  - by blsub6

  I have one guy at my company telling me that I should put FF:TMG in between my main Internet-facing firewall (Cisco 5510) and put my Exchange server and DC on the internal network. I have another guy telling me that I should put the Exchange server and DC in a DMZ I don't particularly like the idea of having my mailboxes and DC's usernames/passwords in a DMZ and I think that Windows authentication would require me opening up so many ports between my DMZ and my internal network that it would be a moot point to have it out there anyways. What are some thoughts? How do you have it set up?

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• iPlanet Authentication provider

  - by Travis

  Good day. I have stepped into project that requires a server migration that would change the means of authentication for our CAC/PKI SSL enabled website. We are using iPlanet 7 and Oracle Directory Server Enterprise 7 as our LDAP server. The situation is that the site is still CAC/PKI enabled, but at the firewall. The information we want to authenticate against is now in the http header. How do I configure iPlanet and LDAP to authenticate against the header instead of SSL? Thanks. Edit, Can this be done with IIS keeping the Directory Server EE LDAP in tact or is the ACL iPlanet only?

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• Windows Server 2008 r2 Hardening [on hold]

  - by Natasha

  I have created windows server 2008 r2, running on VM, Where Running services in Server Manager 1) File services ( in Role) 2) Telnet Client ( Features) Windows Firewall Disabled and we are using TOMCAT APACHE WEB SERVER, here i want to harden the windows server, While running SCW by simply clicking with default NEXT, at last when i have clicked SAVE and RUN now in SCW, immediately my remote desktop services disabled. May I Know the things i want to add in Roles,features and finally want to harden windows ? and also what about audit policy and network settings in that ? Please help me out, Don't Ignore.

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• Why can't my networks reach each other?

  - by HOLOGRAPHICpizza

  We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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• Ad Agency storage/file server +backup needed (NAS or something else?)

  - by Rob

  Looking for a "this is all you need" recommendation. We're a small ad agency with both mac & pcs that access and share files from a 3 yr old Windows 2000 box (no server software). We currently have 1TB on the "server" and back it up to 2 different Seagate Free Agent Pro 1TB external drives. But we're low on space and are looking for something that's bigger, that we can still access from Mac & PC, EASY backup system, secure from viruses, firewall enabled. Not sure if a NAS will work or if we should have a real server. We don't really get on that box except to restore files, or run Norton on it. I hope I've provided enough for a general recommendation. Thanks. Rob Phx

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• How can browsers in VMs resolve hostnames of websites on parent PC?

  - by elliot100

  I have a number of local websites in development on my Windows PC, set up as virtual hosts within Apache, with hostnames (along the lines of dev.example.com) resolved via the hosts file, so I can test them out them with various browsers. I now want to extend browser testing to running browsers in various OSs in virtual machines, and want to be able to resolve dev.example.com from the VMs. Currently these are a mix of VMWare Server and VirtualPC. I know I can edit the hosts file on any Windows VMs, but this is a bit fiddly and I'd like a solution which is independent of the individual VMs. I think what I need is a nameserver, but what's the simplest way of going about this? I'd like everything to be self-contained on the one machine. I think I can cover firewall and Apache permissioning issues.

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• httpd service keep restarting. after 15-20 mins

  - by niraj

  I have recently purchased Dedicated Server which has 16bg ram and 1TB Harddisk. It has Cpanel and for firewall CSF Installd. I am mainly going to install it for File hosting service. Now the day i moved my httpd service keep restarting every 15-20 mins. It becomes unresponsive after that so have to manually restart it. My httpd settings are Start Servers = 5 Minimum Spare Servers = 5 Maximum Spare Servers = 10 Server Limit = 20000 Max Clients = 10000 Max Requests Per Child = 10000 Keep-Alive = On Keep-Alive Timeout = 5 Max Keep-Alive Requests = Unlimited Timeout 300 TOP is top - 14:53:41 up 1 day, 23:39, 2 users, load average: 0.10, 0.14, 0.09 Tasks: 1563 total, 1 running, 1562 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.1%id, 0.2%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 16303780k total, 16142048k used, 161732k free, 135264k buffers Swap: 8224760k total, 868k used, 8223892k free, 14136616k cached Please help me in this its keep happning.

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• Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

  - by mcfrosty

  I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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• Windows 7 wifi reports "no network access" and "no internet access" but connects in fedora

  - by rick2047

  I am running windows 7 home basic (64bit) on a Acer 5742G laptop with Atheos wifi adapter in it. Yesterday, I hiberneted my computer as I always do and up untill then the wifi was working fine. When I booted my computer up again today I started having a strange problem: It detects my wifi but after connecting to it, it keeps on oscillating between states of no network access and no internet access. I can't connect to anything (the internet or my router). I tried to reset my internet protocol stack using this fixit file. I also tried to uninstall and reinstall my network driver. Neither helped. I am using the same laptop's fedora installation right now and the wifi is working perfectly fine. Please help. Edit To add additional details, I have Microsoft Security essentials as my antivirus software and I haven't messed with the firewall or the router configurations.

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• IIS FTP service - download timeouts and restarts getting the data twice

  - by accel229

  We have an IIS FTP site on a Windows Server 2003 x64 machine. Application Layer Gateway service is disabled (so http://support.microsoft.com/kb/931130 does not apply). Windows Firewall service is disabled as well. Connection timeout for the FTP site (there is only one) is set to 1,200 seconds = 20 minutes. An external client can connect to the site, list directory contents and download small files. When a client attempts to download a large file (eg, if the download continues for 3 minutes, which is still under 20 minutes, but relatively long), the server sends all data, then the connection times out, the client issues REST / RETR commands attempting to restart the download since after the last byte (which I believe should succeed and receive exactly 0 bytes), and the server behaves as if the client tried to restart after byte 0, that is, it sends the entire file all over. Any ideas on how to fix this?

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• NAT Error Message - Usage limit exceeded

  - by Kato

  Trying to configure a port to use for Vuze. Using the NAT/server port test, I was getting a message saying the connection timed out, the port was probably closed. I went back and made sure to open the specific port on my router, firewall, etc, but now I'm getting "NAT Error - Usage limit exceeded (173.32.41.24:0). I'm on a mac pro running leopard, trial versions of intego netbarrier and virusbarrier. Network utilities and netbarrier both claim the port is open. I've tested a bunch of other ports, but all give the same message.

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• Explorer hijacked by a trojan

  - by hsdb

  I managed to catch a newish trojan that my Anti virus program wasn't able to detect. I'm usually not that bad at technical stuff regarding computers but I really don't know what to do with this one anymore. The trojan somehow managed to get my Windows to recover it every time I try to remove it by deleting it's exe (called some weird name located in Programs "asdza/saddasn.exe" (example only)). It also sets an entry in my autostart. It starts a second explorer.exe and tries to connect to some server obviously trying to steal data. (glad I still have my firewall) How can I get rid of this trojan, I really need help. It is new and probably unrecognized by all major virus scanners.

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• Airport Express configuration

  - by Christina

  We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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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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• Test-service on Internet for testing incoming INVITE

  - by leiflundgren

  I am trying to set up Asterisk at home. I think I'm having trouble configuring my firewall, so that inbound traffic is accepted, but I am not sure. I got the idea that, perhaps, there is a service out on the Internet, where I can, though a web-browser, initiate an incoming call, an INVITE. And then see the SIP-trace that the remote-part experience. Anyone know of such a service? Note. I have a SIP-PSTN provider so I can generate inbound calls. But I cannot see the SIP-logs from my provider...

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• vmware workstation - virtual network adapters missing from ipconfig, still show in networking (XP host)

  - by Adam

  Hi Folks - here's a new one for me, and my first time posting here: I installed VMWare workstation 7.1 on a new PC. VMWare properly installs the virtual network adapters under the Network Connections control panel, however for some reason they do not show up under ipconfig, which is very weird. They also don't appear anywhere in "route print". I don't have network connectivity to the VM. My guesses are perhaps some conflict with Symantec AntiVirus or Symantec Client Firewall. Tried the following things: enabling TCP/IP in the virtual network adapters (they often get installed with it disabled for some reason) Restoring defualts in the VMnetcfg gui tool (this causes an uninstall and reinstall of the virtual network adapters on the host) Re-installing vmware workstation Uninstalling checkpoint secureremote and then reinstalling vmware Just to be clear, this problem is totally on the host. In my searching for stuff about (non-vmware) adapters missing from ipconfig, I see some posts about resetting the TCP/IP stack using netsh. Looking into that next... Thanks!

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• Instructions to setup domain controller

  - by Robert Koritnik

  Where could I get best step by step instructions (with some simple explanations) how to setup domain controller on Windows Server 2008 R2 Server Core? I don't know what do I need? Do I need DNS as well and AD and so on and so forth. I don't know enough about these things, but I need to set them up to prepare development environment. I would also like to know how to configure firewall on DC machine, to make it visible on other machines because I've setup DC somehow but I can't connect to it... This is my HW config: Linksys internet router with DHCP my dev machine is Windows 7 my DC machine is a VM in my dev machine my dev machine has a network adapter to linksys and a virtual adapter to DC DC machine has two network adapters: one to linksys (to be inetrnet connected) and one to host (my dev Win7 machine)

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• Slow http traffic between VMWare guest and host.

  - by toluju

  I have a web application running as an http server inside the VMWare guest OS, and I'm trying to access the content from the host OS. The guest is running Ubuntu, and the host is running Windows XP. The problem is, when I try to access the application from a browser in the host OS, the content takes a very long time to load (up to a minute for a single page). A browser in the guest OS can access the application with no problems. I've tried using both NAT and bridged networking, but the results are the same. The Windows firewall is turned off. The connection itself appears fine, as ping requests from guest to host as well as host to guest complete without errors or delays. Both guest and host can access the external Internet connection without a problem. I'm using VMWare Player. Any ideas?

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