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• Sending a mail to gmail from my local mail server

  - by tambia

  I just configured a mail server and tried sending a mail to my gmail account with a local email I created with my mail servers dns. I didn't go well. I use redhat server and sendmail and the testing was done with evolution mail. I had the following error : "RCPT TO<[email protected]> failed: <[email protected]>... relaying temporarily denied. Cannot resolve PTR for my ip" How can I solve this?

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• Time Capsule + Ubee Router?

  - by Charlie

  I can't for the life of me figure this out. I recently had TWC installed in my house, and wanted to disable the NAT and router functions of it. I have a Time Capsule hooked up to it from LAN1 (on the Ubee) to the WAN port on the TC. The problems started occurring here. I figured the settings would be these: Ubee Configuration mode: Bridge DHCP: Off TC IPv4: 192.168.100.2 Subnet Mask: 255.255.255.0 Router Address: 192.168.100.1 DNS Servers: 8.8.8.8, 8.8.4.4 Router Mode: DHCP and NAT But using those settings, my TC says "Double NAT", so I have to change it all around to the default settings of the Ubee using NAT. This leads me to believe bridge mode doesn't actually turn off NAT...

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• Firewall is blocking internet traffic to OpenVPN clients

  - by user268905

  I have a virtual network setup with a Linux router/firewall connected to two private networks. An OpenVPN server in routing mode and a web server are in one of the networks. On the other are linux client machines which access the webserver and the Internet through the OpenVPN server. Also, external clients can access the OpenVPN from the Internet. The OpenVPN's server.conf is setup to use routing mode in udp, push DNS and routes to the network it is in so clients can access the webserver. Here are my very strict firewall rules. After connecting to the OpenVPN server, my clients can not access the Internet or the web server. When I allow FORWARD traffic to go through, it works just fine. The OpenVPN server has full internet connectivity. What firewall rule do I need to add to allow internet traffic to reach my clients?

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• How to connect another computer to the router

  - by Call Me Dummy

  I already have a Windows 7 PC connected to my NETGEAR WGR614v10 router and I am able to use internet in that computer. Now I need to connect one of my old computer to the router to share the internet. It's also running Windows 7. I already connected it to the router via a CAT-5 cable but I am not able to use internet. The first computer was set up by a technician. Its IP address is 192.168.1.3, and the default gateway is 192.168.1.1. On the second PC, I changed the IPv4 to 192.168.1.4 and default gateway and preferred DNS to 192.168.1.1, but it's not working. What can I do?

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• Redirect subdomain.example.org to somethingelse.com hidden to the user?

  - by moontear

  I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do own both domains and both domains run on shared hosting. When creating a subdomain, all I can do out-of-the-box is do a HTTP redirect (302, yuck!) or a frame redirect. I also can set the DNS records on one host like nameserver, CNAME - but I would have know clue what I am doing. Please explain to me how routing with nameservers works and how I should (even if not possible with my current host) redirect subdomain.example.org to somethingelse.com with the user-visible URL staying at "subdomain.example.org"

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• ServerA can't access ServerB through UNC path. How do I troubleshoot?

  - by cparker4486

  All my servers are in the same domain on the same network. ServerA cannot access ServerB through UNC path. However DNS resolves correctly for ServerB from ServerA. For example "ping ServerB" works as expected. ServerB can reach ServerA through UNC path without any problem. Likewise all other servers and clients can reach ServerB through UNC path without any problem. The software firewall on ServerB is not turned on and there are no hardware firewalls getting in the way. This makes no sense and I don't know how to troubleshoot it. Nothing shows up in the event logs of ServerA and ServerB has one event (repeatedly): Event ID: 3019, Source: MrxSmb. ServerA is Server 2008 R2. ServerB is Server 2003 R2. I have other 2008 R2 servers that connect without any problem.

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• Uptime concerns in case of AWS outage

  - by Aditya Patawari

  I am running an Elastic Load Balancer backup by 2 instances in different Availability Zones in US East. I am using Multi-AZ RDS as well. Ideally this should ensure that if one AZ goes down, it should not effect the app because everything is spread across multiple AZs. But the recent AWS outage took the app down for a long time. I am not sure how this can happen. It would be great if someone can point out what went wrong. Major question here I have is how can I avoid this in future? I can setup app servers across different regions or even providers and use DNS for load balancing but what do I do with MySQL? Read Replicas will introduce some lag which I would want to avoid.

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• How to configure OpenVPN server to use custom default gateway?

  - by Arenim

  I have a vpn server at address 10.1.0.2 and the server have another ip in it's network -- 10.0.0.2 in his subnet (it's a tun2socks router). But default server's gateway is NOT 10.0.0.2 (and it's ok) but another external IP. I want all the client's traffic to be forwarded through this ip address -- 10.0.0.2. Here is part of my server's config: dev tap0 server-bridge 10.1.0.1 255.255.255.0 10.1.0.50 10.1.0.100 push "route 10.0.0.0 255.255.255.0" ; now client can ping 10.0.0.2 push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 10.1.0.1" push "dhcp-option WINS 10.1.0.1" in fact i want some like push "redirect-gateway 10.0.0.2" How can I achieve this?

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• What is the difference between "could not find host" and "timed out" when pinging fails?

  - by Gutsygibbon

  As the title states. I was trying to ping a bunch of servers whose existence I am not sure of. There are 10 servers in all. Two of them got ping timed out while the other eight have could not find host. The 2 timed out ones show an IP which times out too on pinging. I did a quick nslookup on these servers and they did not have any DNS entries. What is the difference between "could not find host" and "timed out" when pinging fails?

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• Subdomain returns error when restarting Apache

  - by xXx

  I try to install a subdomain on my dedicated server. I made a new DNS rules to point my sub domain to the IP of my serv. After reading this Subdomain on apache i tried to add new rules on Apache : NameVirtualHost *:80 <VirtualHost *:80> ServerName tb.mysite.org DocumentRoot /home/mysite/wwww/tb/ <Directory "/home/mysite/wwww/tb/"> AllowOverride All Allow from all </Directory> </VirtualHost> Then i restart Apache but it returns sudo /etc/init.d/apache2 restart * Restarting web server apache2 Warning: DocumentRoot [/home/mysite/wwww/tb/] does not exist [Wed Jun 27 10:32:58 2012] [warn] NameVirtualHost *:80 has no VirtualHosts ... waiting Warning: DocumentRoot [/home/mysite/wwww/tb/] does not exist [Wed Jun 27 10:32:59 2012] [warn] NameVirtualHost *:80 has no VirtualHosts the tb/ folder is existing, don't why Apache can't find it... And it says that NameVirtualHost:80 has no VirtualHosts...

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• Proxy between data centers [closed]

  - by dstarh

  Possible Duplicate: Can IIS be configure to forward request to another web server? We are switching data centers (actually datac-center to EC2 to be specific) and some customers have not yet made DNS changes to point the domains to the new load balancers. We are thinking of leaving the existing servers up and just using a proxy server to forward the request to the new load balancer. Can anyone recommend a good proxy server for doing this I've got squid installed but it seems it's fairly easy to just have a fairly wide open proxy server and we don't want this. I want all requests coming in on port 80 to be sent to port 80 at a specific domain (elastic load balancer) the data center env is windows 2k3 and the EC2 env will all be linux but the ec2 env should be irrelevant

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• Hosting website when port 80 is taken?

  - by cinqoTimo

  A few months ago, we purchased an R-HUB unit to replace WebEx for remote support. The device operates through port 80, ehich doesn't appear to be configurable. I know in IIS, you can specify a port besides port 80, but the problem is in the port forwarding. On our router, we have to map an incoming port to the forward port which then directs traffic to the node (webserver). However, the incoming port for both the webserver and the R-HUB is 80 - and the server seems to be getting confused as I can only get to the R-HUB, not the website. How can I expose both devices? Host header headers? DNS config?

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• /etc/hosts file for a multi-homed, multi-domain machine?

  - by threecheeseopera

  I have a server (debian) with two network interfaces that I would like to host multiple services and domains on; it is not entirely clear to me how the hosts file should be set up. Example: eth0, bound to WAN interface 1.2.3.4: mail.example.com www.example.com eth0:1, bound to WAN interface 1.2.3.5: www.other-domain.com eth1, bound to LAN 192.168.1.123: some-clever-hostname What should my hosts file look like? (including localhost,localhost.localdomain, etc.) Should I use DNS for some of these entries? Which ones? Thanks!

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• Moving to Data Center

  - by Won

  Please, give me any advice. Our company has decided to move servers to a data center since we are having a major network traffic jam. The data center provides 100MB bandwidth and full 42 unit cabinet for us. Right now, I am planing to have two firewalls for a failover and changing DNS informations for a web server. Is there anything that I have aware of before I move them to the data center? 1. Web Server 2. Exchange Server 3. SQL Servers

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• Cannot access internal network on OSX 10.6.6

  - by cabuki

  Last week, I began having trouble connecting to our internal web servers. Usually, a refresh would take care of it or switching to a different wireless network, but as of yesterday, this wasn't enough. We have an internal DNS server using dnsmasq and a private internal host name (us.lcl). Once I started having more issues with the names not resolving, I tried pinging the server. Using the internal host name (s1.us.lcl), it failed. I tried using the IP address, but that also failed. I have no problems accessing external sites with the exception of it being a bit slower than normal. A reboot yesterday at lunch time after following the instructions here seemed to fix the issue, but when I came into the office this morning, it had stopped working. As of this posting, I cannot ping, ssh or access the web server using the internal host name or ip address. I'm the only one running 10.6 in my office and none of my colleagues has this issue.

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• Windows 7 system CPU bogged by windows services, no explanation

  - by Alex

  I'm looking at a laptop for a colleague which is running terribly slow. A quick look showed that the CPU was 100% used by 2-3 SVCHost processes, which off course doesn't tell much since those are just 'cover' processes with services running underneath them. So I fired up process explorer in hopes of finding a shady rogue service which was bogging the system, but to my suprise I found genuine MS Windows processes (or at least damn-good disguised ones) are bogging down the system: dnscache (DNS Client) IKEEXT (IKE and AuthIP IPSec Keyring modules) iphlpsvc (IP Helper) Seen separately, these processes might seem odd to be using a lot of CPU, but taking a step back one can conclude that all three services are quite closely related to networking. I've tried running: netsh int ip reset log.txt which has helped me save bizarre network-related problems in the past, but this didn't help Off course I though about a virus, but both MS Security Essentials as well as malwarebytes (let both run a full scan).

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• can't enable share on clients in my network

  - by nahman

  i installed on my subnet a win 2003 server as the domain controller, with dhcp and dns options too. the clients, win xp pro and and win 2003 server. in my clients when i log in via the domain, i don't have the option to share folders in the netwrok! i want to share folders this way: right lcick on the fodler Properties Sharing Share how can i make it appear? (if i log in to the computer as the administrator i do have this option) p.s. please be specific for how to enable it, thanks a lot :) nahman.

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• Cannot open mailbox

  - by AdamL

  Ive got a server running Windows Server 2012 and Exchange 2013 on my local domain. Ive got the mailboxes setup and can send/receive emails fine when using OWA. If i try to open the mailbox using Outlook 2010, I get the below error If i try to expand the folder, i get the same message but am still able to use OWA. When I try to run a send/receive, I get the below error: After a bit of researching on the web, people suggest that the profile is corrupt. I have recreated the profile and tried again but still same error. Another post has suggested that the issue is DNS and client PCs should be able to resolve autodiscover.domain.local and server.domain.local to the IP of the server. This is fine on my network. Every user has got the same issue and I am struggling to identify what is causing the fault. Advise appreciated.

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• Cannot connect to domain despite successful pings

  - by egtann

  Pings to my domain name work, but I can't connect via http. I've been trying various methods for a week now, but haven't come up with anything that worked. Any idea what's causing this? /etc/apache2/httpd.conf ServerName machinename.local <VirtualHost *:80> ServerName chipperapp.com DocumentRoot "/Users/myusername/appname/public" <Directory "/Users/myusername/appname/public"> AllowOverride all Options -MultiViews </Directory> </VirtualHost> /etc/hosts 127.0.0.1 chipperapp.com I can access the app from my local machine, but not on any other. I've set up dynamic DNS. Thanks!

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• File upload folder permission fastCGI - How to make it writeable?

  - by user6595

  I am using centos 5.7 with cPanel WHM running fastcgi/suEXEC I am trying to make a particular folder writable to allow a script to upload files but seem to be having problems. The folder (and all recursive folders) I want to be writable is: /home/mydomain/public_html/uploads And I want only scripts run by the user "songbanc" to be able to write to this directory. I have tried the following: chown -R songbanc /home/mydomain/public_html/uploads chmod -R 755 /home/mydomain/public_html/uploads But it still doesn't seem to work. The script will only upload files if I set the permissions manually via FTP client to 777. I assume I am misunderstanding how to set permission for users with fastcgi and hopefully someone can help me. Thanks in advance EDIT: Running getfacl on one of the scripts or folders gives the following: # file: home/mydomain/public_html/ripples/1.jpg # owner: songbanc # group: songbanc So it appears that the owner is correct? I'm now totally confused! EDIT 2: The plot thickens... lsattr and chattr are returning Inappropriate ioctl for device While reading flags on...

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• Can i change the subnet on the vpn side of a server without having to change its whole lan (to avoid collission)

  - by Gusty

  Ohai, ive got a xp server with a client connecting via VPN. Problem (as we all know) is that sometimes the subnets clash. Instead of changing the whole server network every time this happens, cant i just have the server appear to have a different subnet to vpn clients? I have no interest in accessing other computers than the server on its LAN. I tried just turning off automatic dhcp in the servers vpn settings and changed it to 172.31.255.x. The client gets the address assigned alright and it can ping 172.31.255.1 but i cannot ping the server name (because the dns on the clients vpn connection points at 192.168.0.1?) wisdom? PS everything worked until the client hit a network with the same subnet as the server lan. thanks

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• Cisco 5505 VPN RDP not working

  - by user1058275

  I am in dire straights over here. We just changed our LAN from a 192.168.1.0 to a 172.16.4.0. We run Active Directory in our environment and our gateway is a Cisco 5505 ASA. Since the change, our clients can VPN in and make a connection but cannot RDP to any machines that they need to get to on the LAN that they VPN into. I updated the VPN address pool and DNS servers but I'm not sure what else I need to configure. I can send anything you need as I am not an expert and I really, really appreciate the help!

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• Windows 2008 Server network issues

  - by Snowflow

  I have this one server that just doesn't want to be on the internet It's a new server, a twinblade, the other twin works, but not this one. It can connect fine to everythign else in the LAN, but cannot go out on the net It can be reached by ICMP requests over the net (the nagios server can probe it, but not ping it for instance), but not TCP Everything seems fine both in firewall and machine, i get no issues. Anyone care to help me out where i can start looking, i'm seriously confused. edit: it can ping gateway and through the sonicwall site to site VPN, it\s also able to resolve DNS. the only thing it can`t do is reach anything outside of LAN/VPN

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• /etc/hosts in Windows 8.1 doesnt work like in Windows 7 [on hold]

  - by user225438

  Last time when i installed Win7, i configured it to block some netbios names in LAN with hosts file. Something like this: 192.168.0.10 computer_name 192.168.0.10 computer_IP where 192.168.0.10 some ip-address in network, where user need to login to access it. So, when user trying to access computer_name via \\computer_name, he will redirect to 192.168.0.10 rather then going to computer_name. In Windows 8.1 I can't do this trick. I tried to disable Windows Defender, flushed DNS, nbtstat -R. Nothing works. When I pinging computer_name, IP address returning 192.168.0.10, but when I accessing it via explorer (\\computer_name\d$), it opening computer partitions. In Win7, when I trying to access \\computer_name, its trying to open 192.168.0.10 one. Maybe its not the best solution to do this, but it works in Windows 7.

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