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• What other protocols must not be fire-walled for FTP to work?

  - by Chris

  my Netgear router randomly reset itself the other day loosing all of my config settings: DSL details, Firewall rules, the lot! So I set about restoring all of the details manually, but when it came to configuring the firewall I wanted improve the security by explicitly setting 'deny' rules for everything that I figured is 'non-essential', and (although not necessary) whilst I was at it I set explicit 'allow' for the 'essential' protocols. I'll admit now I didn't really know what I was doing and everything was just 'my best guess', but I enabled only DNS, HTTP, HTTPS, FTP, SFTP, TFTP with everything else blocked. This did not work for me as I could not access 99% of web sites (although strangely Google worked!), so I played around a bit more and found that (oddly) if I disabled just the explicit 'allow' rules then everything worked fine, for browsing anyway. Today I came to work on some web-sites via FTP and just could not get a consistent connection, it kept dropping out after a few files or being blocked by the server or simply not connecting. It would authenticate okay but then stop when retrieving the initial directory listing! e.g.: Status: Delaying connection for 1 second due to previously failed connection attempt... Status: Resolving address of ftp.domain.co.uk Status: Resolving address of ftp.domain.co.uk Status: Connecting to 123.123.123.123:21... Status: Connecting to 123.123.123.123:21... Status: Connection established, waiting for welcome message... Status: Connection established, waiting for welcome message... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... I've checked and re-checked the FTP settings (they worked before anyway), I have Googled the I.T. out of the various protocols that I have blocked in the fire-wall but none seem essential to FTP (other than FTP/SFTP etc. which I have passively enabled). I'm (clearly) no server engineer, or protocols / fire-wall expert so I was hoping that some one could maybe shed some light on why my FTP is failing. I've been wondering if I ought to be allowing BGP, BOOTP and/or IDENT (or any others)? What other protocols are required for FTP? Thanks in advance!

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• Putty Help with @ Key

  - by jb0510

  I am new to putty. I am pushing files to a customer with sftp command that includes @ sign in the command. e.g. sftp (login@IP Address) the session will not allow @ on the command line. It bounces me to the next line. Can anyone tell me how to correct this.

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• Socks proxy on mac's shared internet

  - by AliBZ

  Hi all I use my mac's internet sharing to create wireless network for my ipod touch. I have a linux server and I use socks proxy. I wanna use this proxy on my ipod but i don't know how. I put my shared network connection behind the proxy with localhost ip but my ipod isn't behind the proxy. any ideas?

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• Configuration Deployment to Linux Systems

  - by William

  Hello, I'm looking for a nice way to add / remote ips (and possibly interact with an asset inventory system to track where ips are), start / stop processes, download logs, and all around genearal system admin duties from one place. It's okay if I require more than 1 program. That would still be better than having 50 million terminals open and trying to trace ip assignments etc on whiteboards. I'd also like to know if anyone knows any good asset management programs. Best Regards, William

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• DNS CNAME - SSL-certificate issue.

  - by Phoibe

  Hey, I have obtained an SSL certificate by Thawte for domain.com Now my infrastructure changed due to heavy load I have mx.domain.com as SMTP relay storage.domain.com as Mail-Storage and domain.com pointing at Web-Server Every server is hosted on another dedicated/virtual server with individual IP. I do not want to put the Web-Server on the Mail-Storage for security reasons but I do want to use my SSL-Certificate for the Mail-Storage(POP3S/IMAPS). Is that possible or how do I solve that issue?

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• How to implement custom domain feature like posterous?

  - by Weiwei

  here is how posterous works, I make a A record of DNS of my domain (blog.mydomainname.com) to posterous IP address 67.207.139.81 , in the manage panel of posterous , i put my custom domain (blog.meetingly.com). Then i can reach my posterous blog http://mydomainname.posterous.com from http://blog.mydomainname.com url. How posterous implements this? Is this a DNS level thing or web server level setting? Thanks a lot!

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• Web site DNS configuration Without using hosting nameservers

  - by user39110

  Hi, i am publishing my website(www.muratturan.com) by using godaddy's "Total DNS Control". My configuration like this: 1-) I configured my domain to total dns control by setting nameservers to total dns control's. 2-) In total dns control panel i set A host to directly my VPS's ip address. 3-) Also i configured mx records to google apps. Everythings looks good but i am thinking that is this technuqie has any negative effects ? Thanks

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• What is the best way to configure windows firewall to open up sql server to lan computers

  - by Breadtruck

  Should I configure a specific port for SQl Server and open that port up to the lan ip address range or open up the firewall based on the program, and wouldn't this require making a rule for each instance? Do I need to add sql browser as a rule if I want lan computers to see the sql server instance?

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• Does mailx send mail using an SMTP relay or does it directly connect to the target SMTP server?

  - by iamrohitbanga

  Suppose i send a mail using the following the following command: mailx [email protected] then does mailx first try to find out the SMTP server of my ISP for relaying the mail or does it connect directly. Does it depend on whether my PC has a public IP address or it is behind a NAT. How do I check the settings of mailx on my PC? How can I verify this using tcpdump?

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• Proxy Access to my Squid Proxy

  - by Fake4d

  I have a squid proxy cluster to let my users surf in the internet and on intranet ressources. Now there is a special user, that wants to configure another squid in the net of the users. So this proxy wants to access the internet over a proxy-proxy configuration. It doesnt work at the moment. So here is the question: Whats the configuration line for my squid.conf to allow an IP to use my squid as an upstream proxy?

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• Multi-site email relay based on email address (in AD?)

  - by MarkRobinson

  We have a multi site setup currently based around Exchange 2003, but we are getting a lot of traffic over the vpn as only one server has an internet facing IP. Is there such a product that could sit on a hosted rack somewhere that would look at an incoming email and from information in AD determine which mail server to relay the message to?

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• How do I prevent mail from my Exchange server from being blocked?

  - by Mike C

  Recently one of our client machines was infected with a virus and I believe was spamming addresses in the user's contact list. Since then our server has been appearing on blacklists and it has been causing our e-mail to be blocked and returned by many clients. The virus has since been cleared, what can I do to get our server off these blacklists so that we will have more reliable e-mail service? Will I have to change my IP address? Thanks, Mike

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• "No route to host" with ssl but not with telnet

  - by Clemens Bergmann

  I have a strange problem with connecting to a https site from one of my servers. When I type: telnet puppet 8140 I am presented with a standard telnet console and can talk to the Server as always: Connected to athena.hidden.tld. Escape character is '^]'. GET / HTTP/1.1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://athena.hidden.tld:8140/"><b>https://athena.hidden.tld:8140/</b></a></blockquote></p> <hr> <address>Apache/2.2.16 (Debian) Server at athena.hidden.tld Port 8140</address> </body></html> Connection closed by foreign host. But when I try to connect to the same host and port with ssl: openssl s_client -connect puppet:8140 It is not working connect: No route to host connect:errno=113 I am confused. At first it sounded like a firewall problem but this could not be, could it? Because this would also prevent the telnet connection. As Firewall I am using ferm on both servers. The systems are debian squeeze vm-boxes. [edit 1] Even when I try to connect directly with the IP address: openssl s_client -connect 198.51.100.1:8140 #address exchanged connect: No route to host connect:errno=113 Bringing down the firewalls on both hosts with service ferm stop is also not helping. But when I do openssl s_client -connect localhost:8140 on the server machine it is connecting fine. [edit 2] if I connect to the IP with telnet it also is not working. telnet 198.51.100.1 8140 Trying 198.51.100.1... telnet: Unable to connect to remote host: No route to host The confusion might come from IPv6. I have IPv6 on all my hosts. It seems that telnet uses IPv6 by default and this works. For example: telnet -6 puppet 8140 works but telnet -4 puppet 8140 does not work. So there seems to be a problem with the IPv4 route. openssl seems to only (or by default) use IPv4 and therefore fails but telnet uses IPv6 and succeeds.

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• How to copy a 200GB file faster?

  - by RainDoctor

  I got a 200GB .tgz file on server A(RHEL 5.2). I wanna transfer that file to server B (RHEL 5.3). Server B is on ESXi 4 Update1. I gave 10GB to that Server B VM, with 4 vCPUs. Both Server A and Server B are connected with an ethernet cable with local IP addies (no switch involved) scp gives me about 3Mbps. Is there a way to get 400Mbps?

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• "Hostile" network in the company - please comment on a security setup

  - by TomTom

  I have a little specific problem here that I want (need) to solve in a satisfactory way. My company has multiple (IPv4) networks that are controlled by our router sitting in the middle. Typical smaller shop setup. There is now one additional network that has an IP Range OUTSIDE of our control, connected to the internet with another router OUTSIDE of our control. Call it a project network that is part of another companies network and combined via VPN they set up. This means: They control the router that is used for this network and They can reconfigure things so that they can access the machines in this network. The network is physically split on our end through some VLAN capable switches as it covers three locations. At one end there is the router the other company controls. I Need / want to give the machines used in this network access to my company network. In fact, it may be good to make them part of my active directory domain. The people working on those machines are part of my company. BUT - I need to do so without compromising the security of my company network from outside influence. Any sort of router integration using the externally controlled router is out by this idea So, my idea is this: We accept the IPv4 address space and network topology in this network is not under our control. We seek alternatives to integrate those machines into our company network. The 2 concepts I came up with are: Use some sort of VPN - have the machines log into VPN. Thanks to them using modern windows, this could be transparent DirectAccess. This essentially treats the other IP space not different than any restaurant network a laptop of the company goes in. Alternatively - establish IPv6 routing to this ethernet segment. But - and this is a trick - block all IPv6 packets in the switch before they hit the third party controlled router, so that even IF they turn on IPv6 on that thing (not used now, but they could do it) they would get not a single packet. The switch can nicely do that by pulling all IPv6 traffic coming to that port into a separate VLAN (based on ethernet protocol type). Anyone sees a problem with using he switch to isolate the outer from IPv6? Any security hole? It is sad we have to treat this network as hostile - would be a lot easier - but the support personnel there is of "known dubious quality" and the legal side is clear - we can not fulfill our obligations when we integrate them into our company while they are under a jurisdiction we don't have a say in.

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• Where to find ServerName in a PHP Script

  - by Josh K

  I'm looking to retrieve the ServerName field located in /etc/apache2/apache2.conf. My only issue is then calling it in PHP (echo $_SERVER['SERVER_NAME'];) it gives me not the server name but the ip address. If I pull a phpinfo(); I can the server name under the Hostname:Port field under the apache2handler, so I know it's accessible somehow.

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• SMTP host name vs. domain in "From:" address vis-a-vis Email Deliverability

  - by Jared Duncan

  I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: email address seems to be unclear, even after reading dozens of people's articles/input. Specifically, I understand that to satisfy the reverse DNS check, there must be a PTR record for the IP address of the sending machine that yields a domain name that matches the host name of the sending machine / SMTP server. Some say it needs to match the one given by the "hostname" command, most say it's the one provided with the HELO / EHLO statement, and this guy even says they MUST be the same (according to / enforced by what, I don't know; that's only a minor point of confusion, anyhow). First, what I can't find anywhere is whether or not the domain name of the From: email address needs to match the domain name of the SMTP server. So in my case, I have a VPS with linode. It primarily hosts a particular domain of mine, example.com, but I also sometimes do work on other projects: foo.com and bar.com. So what I'm wondering is if I can just leave the default linode PTR record (which resolves to abc.def.linode.com), make sure that abc.def.linode.com is what my mail server (qmail) is configured to say at HELO, and then proceed to use it to send out emails for example.com, foo.com, et al. If so, then I am confused by the advice given here, specifically (in a listing of bad case scenarios): No SPF record for the domain being used in the HELO command Why would THAT domain need an SPF record? And if it does, which domain should it provide whitelisting for: the HELO domain, or the domain of the From: email address (envelope sender)? Also, which domain would need to accept mail sent to [email protected]? If the domains must be the same, that would seem rather limiting to me, because then for every domain you wanted to send email from, you'd have to get another IP address for it. It would also compromise or ruin one's ability to do non-email sending things (e.g. wget) relatively anonymously. However, the upside--if this is the case--is that it would make for a far less confusing setup. I'm currently using the linode.com SMTP+PTR domain and example.com From: address combination without much of any deliverability issue, but my volume is very low and I'd like to know if someone out there has experience with larger volumes and has specifically tested the difference and/or has inside knowledge and/or has an authoritative answer (and source) for this particular question. I'm happy to clarify anything, let me know. Thanks in advance.

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• Windows 7 DNS stuck at manual

  - by Populus

  I am using the google dns servers most of the time, but for one particular wifi connection it blocks that ip so I have to revert back to automatically choosing DNS... The problem now is everytime I connect to this network, I have to change it back to automatic DNS manually (ironically), it's stuck on using the google DNS by default... It's a trivial problem, but would be fab if someone can help me out here...

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• Connection problem to MySQL on another machine on LAN

  - by Ankur

  I'm having trouble connecting to a MySQL database on the other machine on the same network. Could not connect to the specified instance. MySQL error number 1130 Host 'abc' is not allowed to connect to this MySQL server (Pinging ok time 1-3 ms ttl =128) I've checked out the following: TCP/IP enabled RegEdit under hlocal machine .... parameters .. maxUserpORT And timedelay.. Grant all . to 'root'@'Myipaddress'

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• Which protocol do most home routers use to get the names of the connected devices?

  - by netvope

  In most home routers, you can find a DHCP client table. Obviously the router knows the IP and MAC addresses of the connected computers. However, most of the time the router can list the computer names as well. So what protocol do they use to get the names? Perhaps NetBIOS?

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• Way to connect to VPS w/Win Vista Home Basic, other than VNC or TeamViewer?

  - by Tia Peterson

  I need to connect to a VPS and I'm running Vista Home Basic. TightVNC and TeamViewer both require access to the VPS first, because they require that the server be set up with TightVNC or TeamViewer. Is there anything similar to Remote Desktop that will allow me to use the IP address and administrator password to the VPS to simply connect, rather than having to have the hosting company set up VNC or TeamViewer on the server first? Any help would be appreciated!!! Thank you!

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• AWS EC2 - If a server fails and restarts, how do other servers connect to it?

  - by Niro

  Lets say I have an application server and a database server on Amazon EC2. If the db server fails and restarts, how can the app server know the new internal ip of the db server and automatically continue working with it?

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• What to use for small scale server and network documentation? Must run on Linux.

  - by Louise Hoffman

  Does anyone know of a good program, web service, or CMS for documenting servers, IP addresses, logins, and network? Only requirement it must run on and from Linux. And it is just for a small network of 10-15 servers.

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• Sharing a modem INTERNET on LAN

  - by Shadyabhi

  My computer is already connected to a 100Mbps LAN. I can use wvdial to connect to internet using a modem when I have my LAN disconnected. Now, I want to share this modem internet to one of the ip address available on LAN say 10.100.99.56.. First of all, can it be done? How do I go about doing that?

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• How to rectify FDQN error in mirroring?

  - by krishna chaitanya

  While establishing mirroring without witness at last step i am getting an error: One or more of the server network addresses lacks a fully qualified domain name (FDQN). To start mirroring without using a FQDN, click "yes". To specify the FDQN, click "no". Then specify every TCP address by using the syntax for a fully qualified TCP address, and click Start mirroring again. TCP/IP are in enabled mode in Computer management. How to rectifity this error?

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