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• unusual webpage access problem

  - by user28163

  This is one of the weirdest problems I've ever seen and I'm out of ideas. I cannot access a couple of websites from my home pc (for 3-4 days now), or at least they go really really slow ~700b/s I can access these same websites fine from my laptop from same IP address. - The websites originate from different countries and are huge popular sites. - I have tried both my PC's network cards. - I have reformatted my PC. - I have reset my router to factory settings. - I have created virtual computers on my PC, and from inside those I cannot access the webpages. - I have flushed my dns. - I tried specifying my dns server addresses to 8.8.8.8 and 8.8.4.4. I can only access the webpages using my PC, if I first connect to an outside VPN. Again, these sites work fine on the 2 other pcs in this house (same ISP and internet connection). help plz :)

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• Windows Server 2003/Exchange 2007: How to setup public domain mail.foo.com to route to internal exch

  - by ryan.keeter

  Good day, I have an internal Exchange Server 2007 and a Windows Server 2003 domain. At this point in time I have an external DNS setup (DynDNS 29.95 service) to resolve foo.com to my singular public IP address then it gets routed to external facing site. I would like to know how to setup POP on mail.foo.com and SMTP on smtp.foo.com, and more importantly, what needs to be setup in Exchange server to allow for this to happen. My end state is to send email through smtp.foo.com and receive mail on mail.foo.com. As of now, when I create a user within Exchange the default email address is [email protected], and I would like it to be [email protected]. Thank you and I appreciate the help as I am a .NET developer trying to do sys admin work, and it is MUCH harder than I have ever imagined, my hat is off to all sys admins and IT pros.

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• Xmail shows error at Gmail

  - by Karthik Malla

  Hello I am using Xmail server at IP 65.75.241.26 hosted at www.softmail.me using which I can send and receive email to/from all email service providers but unable to receive back from Gmail. This error lies only with Gmail. Experts says that Gmail requires proper working MX records where as for other emailing providers do not bother much. Is MX records the solution for my problem? Or is there any other issue? My mailserver outgoing at softmail.me:25 My mailserver incoming at softmail.me:110 Please help me how to get rid of this issue.

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• "DNS not responding" error with D-Link router and PPTP internet connection

  - by Born2win

  I have a D-Link DIR-615 router since around six months. My internet connection is VPN (PPTP) based, i.e. I have been given a username and password from my ISP and my IP address is dynamic. Since a few days I am experiencing a serious problem. My router connects normally (I can see the yellow light), but my computer is giving me a "DNS not responding" error. I have tried everything (reset, reboot etc.) but no success.

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• Newly added virtualhost not working, domain points to /var/www/

  - by Morgan

  I've had no problem with vhosts before, but for some reason this one isn't pointing to the right document root. The domain is pointing to the correct IP, apache sees no errors with the config file in sites-available, yet it just isn't pointing correctly. Here is the vhost config for the domain: <VirtualHost *80> ServerAdmin [email protected] ServerName mydomain.info ServerAlias www.mydomain.info DirectoryIndex index.html DocumentRoot /var/www/vhosts/mydomain.info/htdocs LogLevel warn ErrorLog /var/www/vhosts/mydomain.info/log/error.log CustomLog /var/www/vhosts/mydomain.info/log/access.log combined </VirtualHost> For the record, I am running Apache2 on Ubuntu 12.10

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• Is there a way to submit a batch of commands to a Cisco router and have them execute from the router?

  - by atroon

  I need to change the configuration of a remote (6 hours' drive) client's Cisco 871 (IOS 12.4.15T) from my location because of some new internet service at his location. To be more precise, I need to change the default route, ip address of the outside interface (Fa4) and disable the PPPoE setup there. Unfortunately, doing any of this will (obviously) break the connection to the router. I do not have an out-of-band management modem set up (I know, I know). Is there any way to enter the commands I need to have run and have them execute one after the other, from a file on flash:? I have never tried anything like that before. Essentially a DOS-style batch file is exactly what I need. Nothing like it seems to be out there except using kron to execute CLI commands, but that is specified here as only taking EXEC commands, not configuration ones. Is there hope, or do I travel?

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• Security measures for CentOS

  - by cappuccinodrinker

  I have been tightening up my web server security and wanted to know what else I can do. I am running CentOS 5 with these measures: - All passwords to FTP, MySQL etc are generated from grc.com/passwords.htm and microsoft.com/protect/fraud/passwords/create.aspx (for the ones which cannot be too long). - Running iptables with all ports shut off except for http mail and smtp, the important ports like FTP SSH are blocked to all except my static office IP. There is also no response to pings. - Rootkit Hunter running daily - The server is PCI compliant according to Comodo - Not running any crappy made php apps, we use Zend Framework for our stuff and do have kayako installed and keep them up to date. Can't really think of anything else I can do... I could implement a brute force measure, but I think I already have by simply changing my SSH port to a number above 10000 and blocking it off with iptables.

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• client subscribed to a multicast group not receiving data

  - by Abruzzo Forte e Gentile

  I have a network that was setup for multicast traffic IN Machine A there is a server application generating multi-cast traffic. I have also different clients subscribing to that mulicast traffic -some client are in the same machine A -other clients are in machine B,C,D # Address I am using IP : 239.193.0.21 PORT: 20401 I don't know why but the client in machine A , even if they join the group, don't receive any data while (and this is the funny part) machine B,C and D receive everything. Checking with Wirshark I can see that the UDP traffic flow is there in Machine A. I am using LInux/Red-Hat Enterprise 6.2 What should I look at? Any setting in the os? Firewall or what?

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• Cisco IOS router config -- how to disable SSH / SNMP on all but loopback address?

  - by chris

  Sorry for the naive question; a quick reading of the cisco docs doesn't answer this question... So I've got a router (say for the sake of argument a 4500 running IOS 15.x) It has interfaces in 3 different subnets -- 10.0.0.1/24, 10.0.1.1/24, and 10.0.2.1/24 It also has a loopback address of 172.16.0.33 How do I make it so that SSH / SNMP and other administrative traffic works on the 172 address but doesn't work on the IP addresses I wish to only use for L3 forwarding? Ideally this can be done by disabling the control plane access to these interfaces not just by using an ACL, but whatever, I don't actually care that much as long as it works... Thanks!

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• Appropriate Network switch for small server cluster

  - by Chris Dutrow

  Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should be able to communicate very fast with each other, especially the Redis server. This will probably require the use of internal IP addresses. We will need to use multi-data center replication to synchronize the Cassandra cluster with the one that we currently have hosted on the cloud Was looking into network switches and we are unsure of the appropriate specifications that we should be looking for. Does the switch need to be "managed" or can it be "unmanged"? Does the switch need to support IPv6 or just IPv4? Do we need an enterprise level Cisco switch, or can we go with something like a $200 DLink managed (or unmanaged) small business switch? Thanks so much!

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• Will disabling NAT on my wireless router cause a performance hit on my DSL router?

  - by user117313

  I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it. At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I was having the Double NAT error. So I set the AirPort Extreme as bridge mode, which disables DHCP/NAT and let my crappy modem handle my internal network IPs. Will this cause any performance hit in my network? I'm worried because I'll outsource this job from AirPort Extreme (premium hardware) to the crappy modem. Before you suggest, I tried setting my modem as a bridge and configuring PPPoE on the AirPort Extreme, however it wouldn't connect to the internet, so I just dismissed leaving the modem as bridge.

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• Can't ping IPs for devices not part of Windows Domain

  - by GiddyUpHorsey

  I have a home network with a Trendnet wireless router and a Windows Domain. The DNS server is on a Windows 2000 Server and is configured to forward queries to DNS servers provided by the ISP. The router provides DHCP and is configured with the Windows 2000 Server as the DNS server. When I connect iPhones to the network over WiFi, the router can ping the iPhones through its browser based admin interface, but Windows machines that are part of the Windows Domain cannot. A laptop was connected to the network over WiFi that wasn't joined to the domain and it could see the iPhones. All machines either have a fixed or DHCP allocated IP on the 192.168.0.* subnet. How do I configure the DNS server or the Windows Domain so that Windows machines can see the iPhones?

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• How to write a ProxyPass rule to go from HTTPS to HTTP in IIRF

  - by Keith Nicholas

  I have a server which is running a web app that self serves HTTP. I'm wanting to use IIS6 (on the same server) to provide a HTTPS layer to this web app. From what I can tell doing a reverse proxy will allow me to do this. IIRF seems like the tool to do this job. There are no domain names involved.... its all ip numbers. So I think I want :- https:<ipnumber>:5001 to send all its requests to the same server but on a different port and use HTTP ( not exposed to the net ) http:<ipnumber>:5000 but not sure how to go about it with IIRF, I'm not entirely sure how to write the rules? I think I need to make a virtual web app on 5001 using HTTPS? then add a rules file.

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• OpenVPN route missing

  - by dajuric

  I can connect to an OpenVPN server from Windows without any problems. But when I try to connect from Ubuntu 12.04 (start OpenVPN) I receive the following: OpenVPN needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options SERVER IP: 161.53.X.X internal network: 10.0.0.0 / 8 What I need to do ? client configuration: client dev tap proto udp remote 161.53.X.X 1194 resolv-retry infinite nobind ca ca.crt cert client.crt key client.key ns-cert-type server comp-lzo verb 3 server conf: local 161.53.X.X port 1194 proto udp dev tap dev-node OpenVPN ca ca.crt cert server.crt key server.key # This file should be kept secret dh dh1024.pem # DHCP leases addresses to clients server-bridge # Push routes to the client to allow it # to reach other private subnets behind # the server. Remember that these # private subnets will also need # to know to route the OpenVPN client # address pool (10.8.0.0/255.255.255.0) # back to the OpenVPN server. push "route 10.0.0.1 255.255.0.0" client-to-client duplicate-cn keepalive 10 120 comp-lzo verb 6

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• Technicolor TG582n with external DHCP server [on hold]

  - by Jack

  We have a small home setup with a Technicolor TG582n on Plusnet ISP. We have a Samba4 DC with DNS forwarding enabled. The DC forwards to the Technicolor. However, the client machines have their DNS settings manually set. This is an annoyance when using laptops on other networks. We would like to have DHCP handled on the server machine, such that when a client connects to the Technicolor, it gets its IP and DNS information from the DHCP server, eliminating the need to manually set adapter DNS settings. However, I cannot find an option to disable DHCP on the Technicolor and am not completely clear on how one would point DHCP services to the server from the Technicolor if there were the option. So, how would one make the Technicolor use an external server for DHCP leases?

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• 2wire modem to linksys router

  - by Imajica666

  I want to hook a Linksys router to my 2wire modem/router (2701HG-b) to share my Internet connection. I ran from an open port from the 2wire to the WAN port of the Linksys but it will not work. I did this before with my cable modem to a router to my Linksys router. It worked then but not now. I read I can turn the 2 wire into a modem only but I need the 2wire wireless access also. IPCONFIG /ALL sees the 2wire with IP info as well as DHCP server/gateway. Any ideas?

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• Active node stops resources when pasive node is shutdown

  - by Wakaru44

  2 nodes, active/pasive. 2 resources, a virtual ip, openLdap, and the nfs mount where openldap saves the data. When both nodes are up, things worked fine. You could move resources away and put the active in stanby. But when i rebooted the passive node, ( with the resources in the active node), and the passive node loses conectivity, all the resources in the active where stopped by pacemaker. I'm reading the documentation right now, but I just need a little quick tip to figure what could be hapenning here. Im using: corosync pacemaker RHEL 6

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• Single hardware unit to protect web servers and implement smart publishing

  - by Maxim V. Pavlov

  Thus far we've been using the combination of Forefront TMG 2010 as an edge firewall + intrusion prevention system + web site publishing mechanism in the data center to work with a few web server machines. Since we develop on ASP.NET, we are IIS and in general - Microsoft crowd. Since TMG is being deprecated, we need to come up with a hardware alternative to protect and serve our data center web cloud. Could you please advise a hardware or virtual appliance solution that can provide routing, flood prevention and smart web-site publishing (one IP - many web sites based on domain name filter) all in one. Even if it is hard to configure, as long as it covers all these features, we will invest to learn and replace TMG eventually.

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• FTP Access Denied when uploading to server

  - by Albert

  Ok, here's the story. I have a server running FTP 'out there' I can connect to it using the admin account, browse files, download files. When I try to upload files, I get 550 Access Denied. I have tried through FileZilla and command line. I have windows firewall turned off (on my machine) I can UPLOAD files from another machine (using the same admin account) on our local network (that means, same public IP) what is the problem? I am running Windows 7, Build 7100 and the other machine on the network is running XP SP3 The thing that gets me though, is that this worked for the last probably 4 months, without a problem, I get back in the office after a weekend today and it won't work...

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• Hosting several domains on one server using IIS 7

  - by Øyvind Knobloch-Bråthen

  I have created several web sites inside IIS7 on my server. All of them use the same ip and port, but different host names. Currently I have set the host name to www.mydomain.com. Now my question is, how do I get my actual domains to target the different sites on my server. Second question. Can I set my host name to only mydomain.com to make sure that all requests to that domain is handeled by the same application? Primarily, I want both www.mydomain.com and mydomain.com to work when the user types the address in their browser.

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• Unable to connect to Cygwin from Mac OS X by ssh

  - by skyjack

  I've started ssh server on Windows 7 using Cywgin and I'm trying to connect to it by ssh from Mac OS X Mavericks. It fails with next error: ./ssh username@hostname -v OpenSSH_6.6, OpenSSL 1.0.1g 7 Apr 2014 debug1: Reading configuration data /usr/local/etc/ssh/ssh_config debug1: Connecting to hostname [my ip] port 22. debug1: Connection established. debug1: identity file /Users/skyjack/.ssh/id_rsa type -1 debug1: identity file /Users/skyjack/.ssh/id_rsa-cert type -1 debug1: identity file /Users/skyjack/.ssh/id_dsa type -1 debug1: identity file /Users/skyjack/.ssh/id_dsa-cert type -1 debug1: identity file /Users/skyjack/.ssh/id_ecdsa type -1 debug1: identity file /Users/skyjack/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/skyjack/.ssh/id_ed25519 type -1 debug1: identity file /Users/skyjack/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.6 ssh_exchange_identification: read: Connection reset by peer Meanwhile I can connect successfully from Red Hat. OpenSSH version on Cygwin: OpenSSH_6.4p1, OpenSSL 1.0.1f 6 Jan 2014 OpenSSH version on MAC OS X: OpenSSH_6.6p1, OpenSSL 1.0.1g 7 Apr 2014 Please advice.

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• Routing traffic to specific web sites through Ethernet, rest via wifi on Mac OS X 10.6?

  - by user32448

  Hi I have two separate Internet connections connected to a Mac and I'd like one of them (via Ethernet eth0 gateway 192.168.2.1) to serve for just backing up to an remote online storage, and the other one (via Airport en1 gateway 192.168.1.1) for all other Internet traffic. I tried using "route" from the terminal as follows: sudo route add -host 98.207.226.113 -interface eth0 (just for testing against the site www.whatismyip.org whose IP is 98.207.226.113, to see through which gateway the traffic is routed) I can see using netstat that the route is added: $ netstat -rn -f inet Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 192.168.1.1 UGSc 49 0 en1 98.207.226.113 192.168.2.1 UGSc 0 0 eth0 However, the traffic in this case does NOT get routed properly through Ethernet, as if the routing definition I made is ignored. Any ideas? Thanks!

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• setting up bridged adapter for VPN server

  - by B. VB.

  I have an Ubuntu linux Linode server that I am trying to install OpenVPN on. I'm following the tutorials (which, it turns out, are quite incomplete). auto br0 iface br0 inet static address 192.168.0.10 network 192.168.0.0 netmask 255.255.255.0 broadcast 192.168.0.255 gateway 192.168.0.1 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off When I add this chunk in my /etc/network/interfaces, and I restart networking, my eth0 interface does not have an IP and I cannot get on the network (I need to use a buggy, slow, and annoying AJAX term to do damage repair). Why does adding this screw everything up? Any tips on how to set up this bridged adapter?? Thanks in advance!

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• How to troubleshoot slow powerconnect 62xx management interface

  - by Hannes

  Our Dell Powerconnect 62xx switches have a very high packetloss on the management interface. I presume this is caused by a new appliance which uses multicast for communication but I am not sure. Our network setup is following: servers a - Dell PC6248 | servers b - Dell PC6248 |- juniper core router servers c - Dell PC6248 | What we see is that the multicast traffic arrives at all servers (but only the servers b use the multicast) and I fear that this multicast traffic floods the switch management interface. The switches' management interfaces are reachable via vlan101, all other traffic is sent over other vlans. When I tcpdump on one of the 2 servers with a vlan 101 ip address, I only get a few arp requests but almost nothing. When I try to ping between these 2 servers, it works like a charm. I would like to know what a good way is to troubleshoot this problem and maybe help me understand what is going wrong on that subnet.

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