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  • OCS 2007 R2 Client not syncing Address book

    - by Noah
    I've checked online for most solution for this issue, but nothing seems to be working. When I check the log files on our OCS 2007 R2 server, it is identifying 25 users in the address book. However, when I try and force a sync with the clients, they do not update. I can find the users if I search for them, but they are not coming down by themselves. Is there anything I can check or force from the client side? There is no address book file locally to delete and re-force down.

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  • How do I configure an interface to have *both* a DHCP address and a static address in Ubuntu?

    - by Paul Hoffman
    In a lab setup, I want eth0 on a Ubuntu server box to get a DHCP address for talking to the outside world, and I also want to assign it a static 10.x.y.z address for talking to other boxes on the local network that have 10.x.y.z addresses. I want to do this by editing /etc/network/interfaces. The man page for /etc/network/interfaces is modeled after "here's a bunch of examples, I hope you can figure out the actual rules on your own". I don't see a way to give one interface two addresses using two different methods (static and dhcp), and initial fumbling didn't produce useful results.

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  • Can ping IP address and nslookup hostname but cannot ping hostname

    - by jao
    On a windows 2003 server I can nslookup www.google.com which returns Server: localhost Address: 127.0.0.1 Non-authoritative answer: Name: www.l.google.com Addresses: 74.125.79.104, 74.125.79.147, 74.125.79.99 Aliases: www.google.com I can then ping 74.125.79.104: Pinging 74.125.79.104 with 32 bytes of data: Reply from 74.125.79.104: bytes=32 time=16ms TTL=54 Reply from 74.125.79.104: bytes=32 time=32ms TTL=54 Reply from 74.125.79.104: bytes=32 time=15ms TTL=54 Reply from 74.125.79.104: bytes=32 time=15ms TTL=54 Ping statistics for 74.125.79.104: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 15ms, Maximum = 32ms, Average = 19ms But I cannot ping www.google.com: Ping request could not find host www.google.com. Please check the name and try again. (this one is different from the other question in that this one has a TLD, it is not a local domain.) Update: I am running a dns server at localhost (127.0.0.1). Even when I change it to use for example opendns, it still can nslookup hostname and ping ip address, but not ping hostname. So what is wrong? Update 2: here is the ipconfig /all result: Windows IP Configuration Host Name . . . . . . . . . . . . : SERVER Primary Dns Suffix . . . . . . . : NETWORK.local Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : NETWORK.local Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet #2 Physical Address. . . . . . . . . : 00-0F-1F-56-3B-AA DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 192.168.7.2 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.7.1 DNS Servers . . . . . . . . . . . : 127.0.0.1 Update 3: Thanks everyone for their help and suggestions. I appreciate that. Ipconfig /flushdns returns: Sucessfully flushed the DNS resolver cache Ipconfig /displaydns returns: 2.7.168.192.in-addr.arpa ---------------------------------------- Record Name . . . . . : 2.7.168.192.in-addr.arpa. Record Type . . . . . : 12 Time To Live . . . . : 0 Data Length . . . . . : 4 Section . . . . . . . : Answer PTR Record . . . . . : webserver.mydomainname.com 1.0.0.127.in-addr.arpa ---------------------------------------- Record Name . . . . . : 1.0.0.127.in-addr.arpa. Record Type . . . . . : 12 Time To Live . . . . : 0 Data Length . . . . . : 4 Section . . . . . . . : Answer PTR Record . . . . . : localhost Update 4: Wireshark shows the following: 3 11.540542 208.67.220.220 192.168.7.2 DNS Standard query response A 74.125.79.99 A 74.125.79.104 A 74.125.79.147 6 42.056794 192.168.7.2 192.168.7.255 NBNS Name query NB WWW.GOOGLE.COM<00> which is weird: when I ping, it sends a packet to 192.168.7.255 instead of asking the DNS server for an address

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  • Static DHCP!?

    - by voyager
    I've found some home wireless routers/ADSL+ modems (ZyXEL 660) talking about Static DHCP, when refering to assosiating a specific MAC to an IP, but still serve the configuration over DHCP. Doesn't this have another name? What does Cisco call this feature (that I know supports because I've used long time ago)?

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  • FTPS SSH Host Key after IP Address Change

    - by David George
    I have a Secure FTP (FTPS) server that my remote sites to upload files to daily via scripted routines that run. I have had issues in the past when upgrading hardware and deploying new servers causing the RSA Fingerprint to change for that server. Then all my remote sites can't connect until I have the old key removed (usually via ssh_keygen -r myserver.com). I now have to change the IP address for myserver.com and I wondered if there is anyway to proactively generate new host keys so that when the server address changes all my FTPS client remote sites don't break?

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  • Set up DNS or F5 VIP to send traffic to a specific port

    - by Sam
    I have a clustered SQL instance set up at SERVER01\dev08 It's assigned to a static port of 1466. Can I set up something which will let users connect to SERVER01 and hit that port? If this is possible, what problems might it create (all traffic coming to this name hitting only one port)? It seems that DNS has nothing to do with ports - nor does the F5 big IP.

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  • Stack , data and address space limits on an Ubuntu server

    - by PaulDaviesC
    I am running an Ubuntu server which has around 5000 users. The users are allowed to SSH in to the system. So in order to cap the memory used up by a process I have capped the address space limits using limits.conf. So my question is , should I be limiting the data and stack ? I feel that is not required since I am capping address space. Are there any pitfalls if I do not cap the stack and data limits?

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  • Exposing the ipPhone attribute to Communicator and the OCS address book service

    - by Doug Luxem
    I am in the process of integrating OCS with our Cisco phone system using CUCIMOC. After some fiddling with the phone normalization rules, it appears that I can get PSTN numbers to be dialed though the CUCIMOC interface (yay!). However, during this process I came to realize that the ipPhone attribute in Active Directory does not appear to be exposed to Communicator (and CUCIMOC). What is strange though, is that I can see from the OCS address book service "Invalid_AD_Phone_Numbers.txt" that the attribute is processed by the address book service. My question is, how do I expose the ipPhone field in Office Communicator? Currently, Communicator maps like this - Work = telephoneNumber Mobile = mobile Home = homePhone Attributes such as otherHomePhone, ipPhone, otherMobile, otherTelephone, otherIpPhone are ignored.

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  • Forcing the from address when postfix relays over smtp

    - by John Whitlock
    I'm trying to get email reports from our AWS EC2 instances. We're using Exchange Online (part of Microsoft Online Services). I've setup a user account specifically for SMTP relaying, and I've setup Postfix to meet all the requirements to relay messages through this server. However, Exchange Online's SMTP server will reject messages unless the From address exactly matches the authentication address (the error message is 550 5.7.1 Client does not have permissions to send as this sender). With careful configuration, I can setup my services to send as this user. But I'm not a huge fan of being careful - I'd rather have postfix force the issue. Is there a way to do this?

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  • Apache restart on Ubuntu - error “could not bind to address 0.0.0.0:80”

    - by william
    I'm a n00b - trying to get apache2 set up on Ubuntu 9.10 (Karmic Koala) on Rackspace Cloud. I have set up/configured OpenSSL and installed Apache, but Apache won't start. I assume its a misconfiguration in my /etc/apache2/sites-available/ssl or /etc/apache2/sites-available/default files) When I try to restart apache using the command: sudo /etc/init.d/apache2 restart I get the following error message: [error] (EAI 2)Name or service not known: Could not resolve host name *.80 -- ignoring! [error] (EAI 2)Name or service not known: Could not resolve host name *.80 -- ignoring! (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs ...fail! For my /etc/apache2/sites-available/ssl I have used a virtual host of *:443. For my /etc/apache2/sites-available/default i have used a virtual host of *:80

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  • BGP Multihomed/Multi-location best practice

    - by Tom O'Connor
    We're in the process of designing a new iteration of our network where we improve resilliency by adding a second datacentre. We'll be adding a second datacentre, with an identical configuration of servers as our primary location. To achieve network connectivity, we're looking into a couple of possible methods. See earlier questions http://serverfault.com/questions/86736/best-way-to-improve-resilience and http://serverfault.com/questions/101582/dns-round-robin-failover-and-load-balancing I'm pretty convinced that BGP is the right way to go about this, and this question is not about RRDNS. 1) If we have 2 locations, do we announce the same IP address block from both locations? 2) If we did this, but had a management ssh interface on x.x.x.50 from datacentre A, but it was on x.x.x.150 in datacentre B. What is the best practice mechanism for achieving this? Because if I were nearest to A, then all my traffic would go to x.50, but if i attempted to connect to x.150, I'd not be able to connect, because this address wouldn't be valid at A, but only at B. Is the best solution to announce 2 different netblocks, one at each location, facilitating the need for RRDNS, or to announce a single block, and run some form of VPN between the two sites for managment traffic?

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  • Is it possible to detect nearby Wi-Fi enabled devices, not necessarily on the same network? [closed]

    - by Sky
    first question on StackExchange ever. I hope I got the right board. I'm trying to create a device (either from a standard AP or some other unconventional means) that will be able to detect nearby Wi-Fi enabled devices. For example, if a cellular phone (iPhone for instance) would be carried into the secured area, its MAC address will be logged. A cellular phone is a good example because it's the most common threat that should be detected. Some important points: The detection can be either active or passive, doesn't matter. The detected device might be connected to a different network, or might not be connected to anything at all. I assume most cellular phones are actively probing when not connected, but I'm not sure. It is important to not only identify the breach, but also to identify the device (MAC address). Conventional hardware is only optional. Distance of detection is at least 6 meters (20 feet). Handling one device at a time is good. Speed of detection is important, under 5 seconds is ideal. So my question is, is this even possible? If so, what can I use in order to make this a reality? Thank you for reading!

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  • Redirect email based on Source IP / Hostname

    - by PostMan
    So, we have a situation where we would like to be able to redirect (ignoring original destination) emails coming through out exchange server (locally sent) to a different email address. The situation is as follows: Testing a new server, this hosts a lot of our custom applications / scheduled tasks (as does the production version of this server). Instead of changing config files / parameters for these applications we'd rather leave them as they are, as we want to be as close to production as possible, however we don't want the emails go to the staff they would normally go to, we'd rather they were sent to a test email address where we are able to confirm the results. The emails look exactly like the production emails (same from / to / cc / bcc) except their source, hence why we'd like to know if the ability to redirect based on hostname exists. Cheers.

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  • Is it possible to configure a CDN so that it will step out of the way for a subset of regional IPs?

    - by rwired
    We have a website which targets customers in China, both expat and local Chinese. We have an ICP license which allows us to host in a datacenter inside China. Internet in China is actually as fast as anywhere else (faster than most places actually), so long as the content is served-up within the boundaries of the Great-Firewall. Anything that crosses the wall is horribly slow. The problem is that most expats have some sort of VPN installed so that they can access all the blocked stuff. What this means is that when they access our site, the traffic first has to go out of China through the firewall to their VPN, and then back in. The performance is terrible, worse than if we were just hosting outside of China directly (which we used to do before the ICP was issued). So I want to use a global CDN to mirror the site automatically, but I only want to deliver the content via the CDN if the user's request IP address is outside of China. Inside China I would like the content to be served by our own server. I also want to be careful with the domain names. We currently use www.xxx.com and www.xxx.cn for language selection purposes, as these perform well in SEO on Google (which the expats use), and Baidu (which the locals use). If possible I would like to avoid having one domain on the outside, and the other on the inside since not all expats use a VPN, and some Chinese speakers also use VPNs. Also some of our legitimate customers in both languages are from outside of China. I also don't want to resort to using something like www2.xxx.com/cn for the outside connection if at all possible, since I have worries about duplicate content and canonical URLs ruining our SEO (unless you know of a quick fix for that). CDNs I'm considering are: Google PageSpeed, CloudFlare, Amazon CloudFront. None of which have datacenters inside China. I have complete control of the .com DNS zone records, but the .cn zones are under the control of the domain issuing body in China. I'm not sure at this time if they would allow even a CNAME to point to an IP outside of China (although I don't see why not). They no longer allow outside registrars like they used to.

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  • LinkSys router suddenly cannot get an IP address

    - by user43208
    I have a linksys router WRT54G2 connected to a cable broadband. Just last week, everything was working perfectly - I would be able to connect my laptop to the internet using WiFi. However, starting last week, I suddenly lost my internet connection. At first I thought something was wrong with my ISP. However, when I tried connecting the cable directly to my laptop, I found out that there was no problem with the internet connection after all. It appears that it is only my router that cannot get IP address. I have already tried cloning my MAC address and reconfiguring my router using the setup CD, but nothing worked. What could be the problem here? Thank you. Regards, Erwin

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  • router cannot get ip address

    - by user43208
    Hi guys, I have a linksys router WRT54G2 connected to a cable broadband. Just last week, everything was working perfectly - I would be able to connect my laptop to the internet using WiFi. However, starting last week, I suddenly lost my internet connection. At first I thought something was wrong with my ISP. However, when I tried connecting the cable directly to my laptop, I found out that there was no problem with the internet connection after all. It appears that it is only my router that cannot get IP address. I have already tried cloning my MAC address and reconfiguring my router using the setup CD, but nothing worked. What could be the problem here? Thank you. Regards, Erwin

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  • MAC address stealing?

    - by Arnis L.
    Recently my i-connection started to get laggy. Sometimes it disappears completely. ISP told me that someone steals my internet. Someone has managed to sniff my MAC address, kick me out and surf web in my place. So... I'm curious - how it's possible to steal MAC address and what makes that mystical thief to be more privileged that when he uses i-net I lose mine? Or my ISP just lies to me? P.s. It's not wifi.

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  • How long are fragmented TCP fragments kept in the TCP server

    - by Justin
    Suppose that a given TCP fragment is fragmented into two IP datagrams, and that the first datagram arrives to the TCP server, but the second datagram never arrives. After a certain amount of time the TCP server sends a keepalive, and determines that the client is alive. What does the TCP server then do with this first datagram? Does is wait for the second datagram to arrive, or does it discard the first datagram?

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  • change email address format with minimal disruption

    - by femi
    Hello, all the email addresses in my organization are in the format [email protected]. this was started when we were a small organization. Now we have grown and need to use something a bit more professional like [email protected] how can this change be implemented with minimal disruption? We currently only use smarteremail. Could recieving ONLY with the old and replying with the new be a solution..till we wean our recipients off the old email address? Any suggestions are welcome. How will moving to exchange help in this instance? Can it be configured to automatically send out using a different address? Thanks

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  • apache sendmail: trying to change user "from" address from apache to domain account

    - by Wes
    I apologize if I am asking a question already answered, but my problem isn't really that I haven't found an answer. I have, in fact, found a half-dozen different "solutions" to my problem, tried them all, in various combinations, and have been consistently unsuccessful. The goal All I want to do is change the envelope "from" address for all email sent from [email protected] to [email protected], always. What I've already done I am running Apache, PHP, and sendmail on CentOS 5.5, [email protected]. We have an SMTP server at 192.168.0.4. The domain's email accounts are all at @domain.org. I have successfully set up "smart host" using this line in the sendmail.mc file: define(`SMART_HOST', `192.168.0.4')dnl Then I set up masquerading, and was hopeful this would solve it. I have this in the .mc file: FEATURE(`masquerade_entire_domain')dnl FEATURE(`masquerade_envelope')dnl FEATURE(`allmasquerade')dnl MASQUERADE_AS(`domain.org')dnl MASQUERADE_DOMAIN(`domain.org.')dnl MASQUERADE_DOMAIN(`localhost.localdomain.')dnl This rewrites "to" addresses, but not "from" addresses. Testing from the command line: sendmail -v [email protected] Always is shown from the local user (in this case root, or my local user account). I had read that "sendmail" command sometimes bypasses masquerading. Nevertheless, using the "mail" command has the same result. After that, I have explored several "solutions", including: mailertable virtusertable FEATURE(`accept_unresolvable_domains')dnl LOCAL_DOMAIN(`localhost.localdomain')dnl FEATURE(`genericstable')dnl /etc/mail/access file /etc/mail/local-host-names file /etc/mail/trusted-users file All to no affect. The last thing I've tried So, I decided to go in a different direction, and try to set the envelope "from" address via PHP, using either the configuration in /etc/php.ini, or adding the -f parameter to the mail() function or to sendmail command. If I run this command: sendmail -v -f [email protected] [email protected] I get this error in /var/log/maillog: Mar 30 08:56:16 localhost sendmail[24022]: p2UCuE8w024022: [email protected], size=5, class=0, nrcpts=1, msgid=<[email protected]>, relay=user@localhost Mar 30 08:56:19 localhost sendmail[24022]: p2UCuE8w024022: [email protected], [email protected] (500/502), delay=00:00:05, xdelay=00:00:03, mailer=relay, pri=30005, relay=[192.168.0.4] [192.168.0.4], dsn=5.1.1, stat=User unknown Mar 30 08:56:19 localhost sendmail[24022]: p2UCuE8w024022: p2UCuE8x024022: DSN: User unknown Mar 30 08:56:23 localhost sendmail[24022]: p2UCuE8x024022: [email protected], delay=00:00:04, xdelay=00:00:04, mailer=relay, pri=31029, relay=[192.168.0.4] [192.168.0.4], dsn=2.0.0, stat=Sent (Ok: queued as B5E2E40E0A2) Which is basically a "User unknown" 550 error. Help Please help. What do I need to change? Should I just start over in the sendmail.mc file? It has a ton of config options stuffed in it, over days of trying things. Why is changing the envelope "from" address via the command line generating a "User unknown" error?

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  • Disable IPv6 on Loopback address (Localhost, Computer name, ...)

    - by Greg Bray
    We tried installing a 3rd party software product on a new Windows 2008 R2 server and found that everything works except for accessing local services through loopback addresses such as localhost or the computer name (ex: VPS-Web which resolves to localhost). We are not using IPv6 and would like to disable it until the software is compatible. I tried using these instructions for disabling IPv6 on Windows 2008 R2 but it did not disable the protocol for localhost. Pinging localhost or VPS-Web will still return ::1: instead of 127.0.0.1. I can use ping localhost -4 to get the correct address, but IPv6 takes precedent over IPv4 so the 3rd party software only gets the IPv6 address.

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