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• Exchange 2007 OWA not listening on SSL port

  - by krs1

  I have an Exchange 2007 server that went down after a power failure. It has OWA access via SSL both externally and internally. OWA is working fine from the internal notwork, however I am getting a timeout when I attempt to connect externally. I pulled up wireshark and noticed that the server actually redirects to SSL. For some reason the server is not listening on the SSL port, and this seems to be causing the timeout. I normally do only development work, but I'm stuck with this since my sysadmin took off for the week and isn't answering my phone calls. As far as I know it shouldn't be a firewall issue. Aside from me not wanting to work on the damn thing, what should I look for?

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• OS X Server: SMTP Server problem

  - by plucked

  Hi, I have problem to setup my mail server. My system is a OS X 10.6.2. Server. I configured the mail server so far, but I cannot connect to the smtp server correctly. Correctly means that I can connect via telnet (and do the "HELO") from another server within the same serverrack, but not from outside. But when I try to telnet my http server, it works fine from outside. I already checked my firewall rules with "sudo ipfw list" and the port 25 is not blocked in any case. What could be the problem with connecting to port 25 via telnet from outside of the serverrack? Cheers

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• Computer connects to lan, but not the internet

  - by Jay

  I have a computer with Vista Home that can connect to the router, but it cannot get on the internet. I cannot ping google.com, the request times out. I've tried this on two separate networks and have no trouble with other computers connecting. I've renewed ipconfig, reset winsock, updated the wireless adapter, and the hosts file looks fine. I've tried disabling the firewall as well as a direct wired connection. I did a scan with Norton and it didn't find anything. Is there anything else I can try before resorting to a system restore? Update (Copied from Answer) Windows Update was able to find updates and install them (though, they could have already been downloaded previously). When I pinged Google by using their IP 66.102.9.103, it said it lost 25 percent of the packets. I successfully flushed the DNS but it didn't help. Also, I found safe mode with networking works fine.

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• Issues connecting VMWare VM to Windows 7 (host)

  - by MasterGberry

  I am on windows 7 trying to figure out why i cannot ping my computer or my VM from the other one, yet I am able to ping the router on both and other computers on the network. My desktop is running windows 7 64 bit and my vm is running CentOS 64 bit (which is what I use to test my web server stuff). At my school the VM has a dedicated IP and i don't have this issue, but I am home now and having issues trying to set this up behind my dumb router...I had already tried changing the VINC (i believe) to hide the vmnet1 and vmnet8 connections from the windows firewall and this seemed to have worked for like 5 minutes and then stopped... Any ideas? Thanks

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• Is it possible to restrict the connection duration per client on the router (say with OpenWRT)?

  - by static

  How to limit the connection duration per client per period (say, one MAC-address can connect only for 3 hours per week to the network). Where could be defined such a rule? In the firewall? So the rule should define not statically times (this is simple), when the client is allowed to access the network, but the duration of the connection per day/week/month, etc. How/where to implement such rules? Is it possible to do so with OpenWRT/DD-WRT?

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• Windows xp media center, iTunes, Home sharing problem with app Remote and Apple tv2

  - by Amador

  Hello everybody, greetings from Mexico, sorry about my english but here it goes: I recently bought and apple tv 2nd generation it works just fine, i can see you tube videos but i cant see my library. My pc is conected to the same wi-fi than my apple tv. I have the latest software. I have my firewall off. I turned off and on my router. Search for iphone, ipad remotes on, sharing my library on my local network on, in itunes. Ive checked that my id was the same. On top of that the Remote app doesnt seem to work either. Please help, im kinda loosing my mind over this

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• rdesktop remote connect windows server 2012r2, device redirection doesn't work

  - by user197677

  I use rdesktop to connect to a windows server 2012r2 from my linux box. it worked well. but it doesn't work when I redirected my local directory /home to the server. My command: rdesktop -a 24 -r disk:home=/home -u test 192.168.1.110 I could connect to the Windows server. but I cannot see the directory in my remote computer. Running net use x: \\tsclient\home' works when I connect to windows 7, but it yields this error in windows server 2012r2: system error 87 has occure the parameter is error I have no idea what to do. I have turned off the firewall and deployed the RemoteFX to enable device redirection.

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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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• Can't Connect To A Game Server

  - by Kirs Kringle

  I'm having issues connecting to a certain game server. The game is Space Engineers. I did a wireshark and the owner of the server did as well and it just tries to request and bind until it times out on the client of the game. Nothing is dropped or red it just doesn't connect to download data from the server. Other people are able to connect to the server just fine. I do not think it is an issue with the server, but what could it possibly be and what can I do to get rid of this problem? I've tried cleaning registry, shutting off windows firewall, restarting my computer, and most recently the wireshark. Thanks,

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• Can't access sub domain from my network [closed]

  - by Maninder

  I am trying to access http://www.abc.xyz.com from my network, but not able to do so. However, http://www.xyz.com is opening fine in my browser. Asked a friend to open abc.xyz.com from his machine(in a different network), its opening fine. Checked my firewall settings as well. There's no such rule to deny the specific site or something that could be denying access to the sub domain. Kindly advise, how I can troubleshoot my problem.

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• Website is live but ping times out

  - by infinity

  I have a client's website that is running on GoDaddy hosting and started behaving very strange recently. The site is up and running but when I try to ping it I get time out. The problem is PayPal doesn't work also Google Webmaster reported the site is down. The client spoke with support and they said there is no firewall or any other traffic filter on their side. The site itself is PHP. Any ideas are welcome. I've tried to send test IPN from PayPal to the payment URL and got: IPN delivery failed. Unable to connect to the specified URL. Please verify the URL and try again. Which makes me think that the website/server is inaccessible in some specific cases. The site URL is http://www.flavourly.com P.S.: I tried to ping it from different machines, ISPs and OS

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• "Meet in the middle" with SSH

  - by stillinbeta

  I have an interesting question regarding SSH. I have a machine at school that I'd like to be able to access from elsewhere. It's behind a firewall/NAT, so I can't get at it directly. I have a leased web server that I can SSH into from anywhere. I was wondering if I could do some voodoo with port forwarding to get to my machine at school via the web server. I think this comes down to whether you can do SSH "backwards," which may or may not be possible. Basically: Machine A can access Machine B Machine C can also access Machine B How can Machine A access Machine C?

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• Computer restarts infinitely after Bios/Motherboard screen

  - by user13176

  Like every morning I turn on my computer (which is kinda new and only couple months old) and I never had any issue with it until now. It starts booting, shows that very first screen which has some motherboard picture and stuff and then it show which buttons to press to enter BIOS and etc. Then it suddenly restarted and after that just kept restarting every 3-5 seconds forever. What could that be? I unplugged power cable, checked all the cables, moved a case, it had some wires stuck under it, blew some dust (but didn't open the case yet) and I tried to boot again and it booted successfully and I am writing this issue now. My specs: i3-3220 3.30Ghz 8GB DDR3 RAM 1TB HDD GeForce GTX 650 Windows 8 x64 I also recently upgraded my security software (that's the most recent thing I did) and it includes ZoneAlarm firewall, Comodo Antivirus and Spybot Search & Destroy. But maybe it doesn't have anything to do with this. Cheers

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• How to make ssh match known_hosts to host/ip:port instead of just host/ip?

  - by Prody

  I have two machines behind a firewall, with the ssh ports forwarded to 2201 and 2202. When I ssh host -p 2201 it asks if I trust the machine, I say yes, it gets added to ~/.ssh/known_hosts Then I ssh host -p 2202 it doesn't let me, because there's already a known_host for this IP in ~/.ssh/known_host:1 (the file was empty when I started, so line 1 is the one added by the previous ssh run) This happens on CentOS 5.4. On other distros (I've tried Arch), it appears that ssh matches the knwown_hosts to the ports too, so I can have multiple fingerprints for multiple ports on the same host/ip without any problems. How can I get this same behavior for CentOS? I couldn't find anything in man ssh_config. (or at least not without disabling fingerprint checking)

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• IIS is not accepting connections after WIndows system update

  - by user78102

  I've been running a web site for the past year on Windows Home Server 2008 R2. After the March 2012 system updates, the site is no longer accessible to clients. They see this error: website is online but isn't accepting connections. Ping tests to the FQDN of the server are successful and NSLOOKUP returns the correct result. The Internet connection tests out good from the server. I have not changed my internet connection (Comcast Business Internet) or my router configuration (I forward incoming requests from the outside to port 80 of the local IP address of the server). I have tried: Disabling the Windows Firewall. Rebuilding the OS and configuration. I still have the problem. How can I resolve this?

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• Allowing ssh in iptables

  - by sat

  I am doing iptables firewall configuration. Actually, I need to allow ssh connection only from particular IP. But, It is blocking the ssh connection. I used the below commands. sat:~# iptables -F sat:~# iptables -A INPUT -p tcp -s src_ip_address -d my_ip_address --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT sat:~# iptables -A INPUT -j DROP sat:~# iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- src_ip_address my_ip_address tcp dpt:22 state NEW,ESTABLISHED DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination If I try to connect from src_ip_address to my_ip_address, it is blocking the connection. Even, It is blocking from my_ip_address to src_ip_address . I haven't put any rules for OUTPUT chain. What is wrong with my commands? How to allow ssh in iptables?

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• Download resume support blocked by isp?

  - by John Doe

  Can ISP block resume support for downloads ? I'm using IDM (internet download manager) to download of the internet from resume supported websites, yet I am unable to resume downloads. I tried different computers with the same result. Turned off firewall, didn't have any effect i was able to download with no issues until a couple of days ago. Another thing i noticed is that before IDM used to try to connect to several connections to speed up my download, but now it can only connect to one connection. Also i tried to download using my vpn, and i was able to download and resume downloads with no problem.

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• mod_security: How to allow ssh/http access for admin?

  - by mattesque

  I am going to be installing mod_security on my AWS EC2 Linux instance tonight and need a little help/reassurance. The only thing I am truly worried about right now is making sure my (admin) access to the instance and webserver is maintained w/o compromising security. I use ssh (port 22) and http (80) to access this and I've read horror stories from other EC2 users claiming they were locked out of their sites once they put up a firewall. So my question boils down to: What settings should I put in the mod_security conf file to make sure I can get in on those ports? IP at home is not static. (Hence the issue) Thanks so, so, so much.

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• Random Connections to MySQL refused (Error 111)

  - by joatis

  A Perl/CGI webapp that has been running fine for almost a year has started to randomly been unable to connect to a remotely hosted MySQL. The Error thrown is : Can't connect to MySQL server on 'xx.x.xxx.xx' (111) Reloading the page often solves the problem The client is using Perl, DBI and SSL to connect to MySQL using the same configuration file each time. MySQL 5.0 Server Running RH EL5 Quad-Core AMD Opteron(tm) Processor 2374 HE, 8 cores Real Memory: 15.73 GB total, 11.81 GB used allows networking in my.cnf max-connections are not being met load is low. The servers firewall is open to the client's subnet. The mysql user has permissions from the client's subnet. I have my host looking into the problem but so far we're all stumped as to way the occasional connection is (increasingly getting refused) Any advice what to check that would cause the random refusal of connections?

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• Resolving Domainnames differently for different services

  - by mlaug

  Some time ago we had an issue with our network infrastructure and php with curl. Our Network infrastructure is fairly simple. LoadBalancer/Firewall = 5 servers The Domainname of our website is set to the ip of the Loadbalancer, of course. But calling curl from one of the servers did result in a timeout. It appears that a server could not call for its own domain it is serving. So we had to set the domains via /etc/hosts to the sever itself. But now We have implemented a Varnish in front of the Loadbalancer, which we want to automatically purge, once a change on a page happens. So now we need to call the domain www.example.com/url_to_purge. Sadly this call what be resolved to the server itself instead of the varnish, because of the /etc/hosts entries. So now I am wondering, if you could resolve domain names differently for different services :)

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• How to enable/disable authentication without password when executing commands as superuser?

  - by 44taka

  On a Fedora 19 system which I set up for somebody a while ago I noticed that no authentication is required when commands are executed as the superuser. So, for example, when running Yum Extender, configuring the firewall or running some command with sudo in the terminal, I am not asked to provide a password. (With graphical applications the authentication dialog pops up for a few milliseconds.) For better security I would like to disable this automatic (authentication-less) assumption of superuser privileges. I do not remember if or how I enabled this authentication without a password. I might have enabled it for convenience for the non-pro user of this machine, but did not do any "fancy" things (like editing config files) to do so. I did not edit the sudoer file. I just checked that. I might have checked a "Do not ask for password again" checkbox or something similar. Whatever I did, I would like to undo it and enforce authentication for superuser tasks again.

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• Can't connect to localhost via browser. Can ping localhost.

  - by Sceptre

  I'm trying to connect to localhost through my browser to learn some apache tomcat stuff. When I tried to connect to localhost through Firefox, I couldn't; when I tried through IE, I could the first time, but not after that. I'm using Windows 7, and changed the hosts file to point localhost to 127.0.0.1. I can successfully ping localhost and 127.0.0.1. I have tried turning off my antivirus and my Windows Firewall, but to no avail. What am I doing wrong?

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• Apache not responding in amazon ec2

  - by Viren

  Well this might sound awkward but I facing terrible issue with my Amazon EC2 instance one of the finding I see is that apache is not responding on port 80 which is weird because I can't even find the incoming packet to port 80 in tcpdump output As per the security rules all security rules are in place correctly at least in amazon console I restarted the apache to listen to port 8080 and added port 8080 and add 8080 to security rule and everything work but I cant just able to understand as to why the port 80 not responding Needless to say since port 8080 is responding all my CNAME and A-record is working too UPDATE No firewall issue either I just cross check the iptables and list is empty Can some share a light on this

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• Kvpn on ubuntu 11.10 is stuck on 'Connecting'

  - by xupv5

  I recently installed open-vpn and it's gui, Kvpn, on my ubuntu system but after I load the configuration file and click 'Connect' it just runs through and gets stuck on 'Connecting', never actually getting connected. How do i get around this or what might i be doing wrong? The profile was set up using a .conf file and the network i'm trying to connect to needs only a username and password. I'm on a wi-fi connection, with one network card(also behind a university firewall, i suppose). Any help regarding connecting to a vpn on ubuntu would be much appreciated. Thanks!

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• intermittent SSH with ssh_exchange_identification error

  - by rafamvc

  My ssh connection to my server works every 30 min for around 10 min. Things that I figure out that might be the problem: The server is underload (it is a database server), but on those spare moments that I can connect, it is still under the same load, which doesnt make sense. The server is a ubuntu, and the consolekit was using a lot of virtual memory. Restarted the consolekit and it seems to be using a right amount of memory now. It is not the host alows or deny. Those are setup properly. It is not a firewall problem. Those settings were working and the same settings are working for other similar machines. It is on the ec2. Amazon cloud.

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