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• Can't Allow Specific Port in Windows Firewall Advanced Security - Windows 2008

  - by Jody

  In the Outbound Rules, I set up a rule to allow outbound connection from port 26. But, it doesn't work. However, if I allow "all port" for this rule, this will work, but then all ports will be allowed too. What is the reason? Is there any conflicting rule? I need to fix this as soon as possible. -Edit to add : I'm trying to allow email access to mail server outside (port 26). The thing is, even if I telnet using port 26, it will not work, unless I allow "all ports". Specific port will not do.

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• does the *physical* order/location of drives in a mdadm-managed RAID-10 array matter?

  - by locuse

  i've setup a 4-drive RAID-10 array using mdadm-managed, software-raid on an x86_64 box. it'd up & running and works as expected, cat /proc/mdstat md127 : active raid10 sdc2[2] sdd2[3] sda2[0] sdb2[1] 1951397888 blocks super 1.2 512K chunks 2 far-copies [4/4] [UUUU] bitmap: 9/466 pages [36KB], 2048KB chunk atm the four SATA drives are physically plugged into the motherboard's 1st four SATA ports. i'd like to gather the necessary/complete info for catastrophic recovery. reading starting here, http://neil.brown.name/blog, and the mailing list, i'm not yet completely confident i have it right. i understand 'drive order matters'. is that logical, &/or physical order that matters? if i unplugged the four drives in this array, and plugged them each back into different ports on the motherboard or a pci card, as long as i've changed nothing in software config, will the array correctly auto-re-assemble?

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• Problem with several USB devices on Windows XP. How to diagnose USB device?

  - by Lukasz Baran

  Hello All, Recently I've bought some electronic devices (like e.g. Sony Ebook reader PRS-600 or HP PDA IPaq) which are connected to PC using USB ports. These devices have own batteries and they are recharged using USB. However, I am experiencing a problem with Ebook Reader and the similiar thing happens with my PDA (but in this case it's more rare). Sometimes, I am unable to make it start recharging, when it's connected to USB port. The LCD diode on my Reader lights up and the icon in the system tray appears. They both indicate that the device has been connected. However, the device should start recharching and it should appear on Windows XP as a 'explorable' device (just like pendrive it offers some HDDs). None of these happens:( This problem appears on two PCs - desktop and laptop. Both have Windows XP SP3 installed. And what's interesting and surprising to me is the fact that these devices sometimes work without any problems. I mean, I just plug them in and they work properly. Besides that, there are some computers (I have tested a variety of possible conditions) on which the problem does not appear! I am confused and, on the other hand, determined to find out what is the real cause of such strange behavior. Maybe I'm wrong but I always assumed that I'm using deterministic machines, but the described situation makes me feel like I was dreaming:) And that's why I'm asking you here. Are there any tools that could help me diagnose USB ports? Or maybe anyone knows the solution? I have a lot experience with low level programming (mostly from the times of MS-DOS applications), but I'm not an expert when it comes to WinXP technology. If this was a problem with network connection, I would know what to do - I know how to track network traffic, but with USB ports I feel powerless. I have a feeling that the problem may lie in a way WinXP handles USB devices. Personally, I hate auto-discovery and P'n'P features available in Windows. I know that some of may suggest to move to Linux or other *Nix system. Unfortunately, I have to use WinXP in my professional life, so it's rather impossible. Besides that, I don't consider XP as a total disaster. Any help from you will be appreciated!

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• Decent 1gb switch (16-24 port) for rack...

  - by TomTom

  Hallo, for a rack containing a smaller nubmer of servers (5 at the moment, going to stay in this area), I look to replace the currently aging 100mbit switch with a 1gb switch. This is for the backend between the servers. I expect some ISCIS traffic there ,so a 10gbit option would be nice (preferably for two ports, as extension modules). I dont need management, this is a pure backend of an internal cluster. I do VLAN, but there is no sensible management the switch can do there. I wuold like: * 1he only, obviously * preferable limited moving parts. * Low price ;) * Enough power to run at least half the ports in full speed at the same time. Anyone any recommendations?

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• Asus WL-520GC + external HDD via Ethernet

  - by Azat

  Has anyone experience of using such combination? Exactly with the same model (or from same model line). How does it works? How hard is to set up all that? What difficulties? I use this router a couple of years, but now i haven't such external drive at my disposal. I want to buy something like Verbatim 47591 or Western Digital WDH1NC10000. (By the way, my router has no USB ports, therefore only Ethernet-ports for external HDD are supported.) Thanks you a lot in advance!

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• Use teamviewer for running web server [closed]

  - by Steve

  I have a PC behind NAT. I want to host a web server on it which is accessible from the internet. I cannot open any blocked ports nor do i have admin rights on the computer. But it has a teamviewer client running on it 24*7 to which i do have access(no vpn installed). I can accesss this client from anywhere using teamviewer. I want to know if somehow i can use teamviewer to get a ip/hostname that is accessible from the internet and host a webserver. Also is it possible to get an ip if i get admin access but without opening ports.

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• Suggestions on providing HA access to an external (fibre) RAID subsystem

  - by user145198

  We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to this storage system occur via HA Linux. Ideally I would connect 2 fibre ports from each controller into each Linux server, and then export either NFS or iSCSI via a 10 Gbe interface. I have seen plenty of references to DRBD, however all of those references tend to use block storage that is solely attached to each machine, rather than having a shared block storage device, so I am unsure if DRBD could (or should) be used in this case. Ideas?

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• Airpot 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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• Laptop dual ethernet?

  - by mgb

  Anyone know of a laptop with dual gigabit ethernet ports?

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• Laptop dual ethernet?

  - by mgb

  Anyone know of a laptop with dual gigabit ethernet ports?

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• Windows 7 VPN wont allow FTP, route FTP traffic through local network

  - by Rolf Herbert

  I use a VPN on my windows 7 PC for privacy and currently route all my traffic through the VPN. This arrangement is fine and its plenty fast. Unfortunately the VPN does not allow any FTP traffic so when I am updating websites I have to disconnect the VPN and work through my local connection. This is annoying and cumbersome. I have read a little about split tunnelling but this is not quite what I need, and it often talks about 'internet' traffic which is not specific to certain IPs or ports. Is it possible to route traffic on certain ports through the local connection, or is it possible to route traffic on certain IPs through the local connection using stuff built into windows 7..? Thanks

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• Adding a new USB port inside a Macbook Pro

  - by MikeC8

  I have a USB Dongle that I'd like to put inside my Macbook Pro. I have already found a spot that will fit the dongle. The next question is splicing one of the USB ports and connecting it to the dongle. Here's a photograph of the inside of my Macbook Pro, showing the USB ports and a little gray plastic divider with four holes in it above each port. http://min.us/mvoQEem My question: Does anyone know what is inside these holes? Presumably each one is a pin for the USB port, right? Can I just stick a wire in there, giving me 4 pins, plus the fifth attached to the metal outside the port? More generally, any one have any ideas for what might be the easiest way to get a USB port inside my MBP? :) Thanks!

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• Multiple monitors on ATI Radeon HD 5450 1GB DDR2 (Brand: Sapphire)

  - by Robert

  From other posts here, I understand that it might be possible to use up to 3 monitors on this card. My understanding (from the other posts here as well) is that since I have a HDMI output, I do not have a 'DisplayPort', right ? Mine has indeed 3 ports: DVI, HDMI and VGA. Can I have dual-monitor using both the HDMI and DVI ports simulataneously (I am not looking for Eyefinity, but simply extended desktop). Currently I am using dual monitor with DVI and VGA but will replace my 17 inches next week with a new (larger) one that has both VGA and DVI, so I intend to use both monitors connected digitally. I intend to purchase a cable ''HDMI to DVI''(MM) to do so on the second monitor. Optimal resolution on the one I intend to keep (22 inches) : 1680 x 1050, primary monitor. New one (24 inches) has an optimal resolution of 1920 x 1080. Am I running for problems ? Thanks, Rob

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• Limiting and redirect port access with useragent

  - by linuxcore

  I'm trying to write iptables string match rule To block http://domain.com:8888 and https://domain.com:8888 when it matches the supplied string in the rule. And another rule to redirect the ports also from 8888 to 7777 I tried following rules but unfortunately didn't work iptables -A INPUT -p tcp -s 0.0.0.0/0 -m string --string linuxcore --algo bm --sport 8888 -j DROP iptables -t raw -A PREROUTING -m string --algo bm --string linuxcore -p tcp -i eth0 --dport 8888 -j DROP iptables -t nat -A PREROUTING -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j REDIRECT --to-port 7777 iptables -A INPUT -t nat -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j DROP I want to do this from iptables not the webserver because the server may not have a webserver and those ports are working on internal proxy or something like ..etc

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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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• some questions about raid card

  - by cpps

  I have some questions about raid card. Use LSI MegaRAID® SAS 9260-8i raid card as a example. There is only two connection ports on the raid card, and they provide two cables that can connect 8 SAS/SATA storages. The document say it can connect "Maximum 32 drives per controller", I want to know how can I connect more than 8 hard disks with this card. Is that they say "Eight internal SATA+SAS ports" means they provide two cables which can connect 8 hard drives, but you can use other way to connect Maximum 32 drives? The other question. I see host bus adapter has raid integrated , so what is the difference between host bus adapter and raid card. Are they the same? I also know is SAS/SATA Expander's function only to connect more hard drives? Thanks in advance.

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• How does Apache handle port forwarding?

  - by vfclists

  I setup a localhost portforwarding configuration in the coLinux .conf file, forwarding port 8090 to port 80 in the VM. When http://localhost:8090 is entered in the browser, I get the correct response from nginx, but with Apache the response get the error /htdocs not found in the log. However if I do a local port forwarding from 8090 to port 80 via SSH Apache responds fine. Is there something about the way Apache handles the port redirection that causes it to fail? PS, For those unfamiliar with coLinux it allows localhost connections to get to the VM by forwarding localhost ports on the Windows host to ports on the VM, as the 10.x.x.x IP it not accessible from the Windows host.

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• Which SATA controller is better to use with Windows Server 2008 R2 64 bit?

  - by at8eqeq3

  We're preforming some hardware upgrade on our server machines. As a part of this process, we have to install some additional disk drives. Unfortunately, total number of drives will become 7 or 8, while all of our motherboards have only 6 SATA ports. Obviously, we need additional disk controllers. For now, we've tested Silicon Image (actually, no-name) and Adaptec controllers, both on SiI3132 chip, and got some problems with drivers for them: Silicon Image drivers are not installing at all, and Adaptec ones are installing, but the system says they're not signed and becomes unbootable. We're tryed both drivers from controllers' CD's and latest versions from manufacturers' websites, and no luck. So, can you recommend some SATA controllers that will really work without tambourine dances on mentioned OS (we need just 2 SATA ports and PCI-E, while RAID and any other features are no-matter)? Thanks for any help.

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• 3 screens on W500 + ATI V5700 + docking station

  - by rafek

  I've got Lenovo W500 with D-SUB and DVI ports. Most of the time I work with a docking station which has D-SUB and DVI ports, as well. I used to have laptop + 22" monitor (DVI) configuration. Now I've got laptop + 22" (DVI) + 19" (D-SUB). I was trying to configure everythin but with no success. I've got ATI V5700 in my laptop. And my ATI CCC allows me to only have one external monitor attached at the time. :( Is there any workaround to this situation? I'd like to have the configuration I've just descripted: laptop + 22" (DVI) + 19" (D-SUB).

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• USB keyboard not recognized by motherboard with only a legacy PS/2 header

  - by Luis

  I've bought a D945GSEJT Atom motheboard that has three usb ports available and no PS/2 connector, just a PS/2 header. I have a PS/2 keyboard with a PS/2 to USB adapter and connected it to a USB port. I tried all three USB ports. The problem is that the board seems to not recognize my keyboard. None of the keys I press are detected by the system. I've read that maybe I could try to change BIOS USB settings to solve this detection problem. But how can I do it if I can't type anything? Is there any other option other than buying a PS/2 adapter and plug it to the PS/2 header?

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• Recurring network issues the same time every day.

  - by Peter Turner

  Something has been happening on my company's network at 9:30 every day. I'm not the sysadmin but he's not a ServerFault guy so I'm not privy to every aspect of the network but I can ask questions if follow up is needed. The symptoms are the following : Sluggish network and download speed (I don't notice it, but others do) 3Com phones start ringing without having people on the other end. We've got the following ports exposed to the public for a web server, a few other ports for communicating with our clients for tech support and a VPN. We've got a Cisco ASA blocking everything else. We've got a smallish network (less than 50 computers/vms on at any time). An Active Directory server and a few VM servers. We host our own mail server too. I'm thinking the problem is internal, but what's a good way to figure out where it's coming from?

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• How do I stop someone from saturating my line & wasting CPU cycles

  - by JoshRibs

  My web host shows inbound & outbound traffic with mrtg. I have a steady 3.5mbps inbound traffic from Nigeria. Even assuming the source IPs & destination ports are blocked with Iptables & verifying nothing is listening on those ports, will the traffic still always pass through the switch & "get" to my server (where my server wastes CPU cycles "dropping" the packets)? Assuming I was setup with a hardware firewall, the traffic would still show in mrtg assuming the firewall is behind the switch? So is there any way to stop someone from saturating your 100mbps line, if they also have a 100mbps line? Other than filing an abuse complaint with the kind folks in Nigeria?

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• How to elegantly selectively exclude FreeBSD network traffic from OpenVPN interface by port

  - by Polygonica

  inexperienced sysadmin here. I'm planning on running a net daemon inside a FreeBSD jail through OpenVPN, but want to be able to SSH directly into the jail and use the daemon's web interface daemon without going through the VPN. As I understand it, an OpenVPN tunnel is normally set up as a default virtual internet interface, and so incoming traffic will go out on the OpenVPN interface by default (which is problematic, as this incurs latency). I thought "well, obviously, since all of this traffic is leaving on a handful of ports, I'll just redirect those to the non-VPN gateway." I've tried to look for solutions, but almost all of them involve iptables instead of ipfw (which is default for FreeBSD) and solve slightly different problems. And alternate solutions like using multiple default routes to ensure that incoming traffic on any interface is always sent out on the same interface seem far-reaching and require deep knowledge of all tools involved. Is there an elegant way of ensuring that traffic leaving on specific ports exits on a specified non-default interface using ipfw?

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• USB port causing device problems after new motherboard upgrade

  - by enbuyukfener

  I'm looking into a PC with an issue with one of the front USB ports (perhaps both). It was working before a motherboard upgrade but since then, a USB drive was inserted, overheated and does not appear to be working. Then a phone (with USB charging) was plugged in, and the phone OS suspended. Removing and re-inserting the battery led to the phone (and hence battery) working, however the battery no longer charges (including with a wall charger). It seems too much to be a coincidence and am wondering what the issue may be? Ideas so far are short circuiting, or over-current to the USB ports. Note: Did not occur to me, so details are not 100% accurate or complete. Feel free to ask for missing info that I may have forgotten though.

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• Does a single LACP channel over multiple switches increase redundancy?

  - by Sirch

  I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been to a single switch, with a redundant channel to another port. Without getting into vendor specifics, my thought is that as this is a single LACP, the likelihood that an event or change could lead to a wide service outage. Without having the spare equipment or time to test this single channel over diverse switches, could anyone with a greater networking knowledge than myself, tell me if there a network side event that would bring down the network connectivity to a server that had created a bonded interface to two ports on separate switches? Does the use of bonded ethernet channels across multiple switches (that we are advised that we can use) from the server, provide both improved throughput (unquestionably), and improved redundancy (uncertain). Could/would network events such as switch failure, port migration, patching, recovery, etc, cause the channel for both server network interfaces to be unavailable? Thanks in advance.

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