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Search found 388 results on 16 pages for 'firewalls'.

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• Improve performance on Lync desktop sharing

  - by Trikks

  I'm using Lync 2010 server to handle some clients communication and screen sharing. The biggest issue is the performance with screen sharing, it is of rather high quality but the frame rate is very poor. I have been reading and searching a lot on the subject and 95% of all topics is about bandwidth, we have a 200/200 MBit Internet connection solely for this application. Also my test machines runs on an internal gigabit lan. The speeds between all boxes is hysterically fast. Next step was to ensure that there where some profiles for different bandwidths, so i registered some New-CsNetworkBandwidthPolicyProfile -Identity 50Mb_Link -Description "BW profile for 50Mb links" -AudioBWLimit 20000 -AudioBWSessionLimit 200 -VideoBWLimit 14000 -VideoBWSessionLimit 700 New-CsNetworkBandwidthPolicyProfile -Identity 100Mb_Link -Description "BW profile for 100Mb links" -AudioBWLimit 30000 -AudioBWSessionLimit 300 -VideoBWLimit 25000 -VideoBWSessionLimit 1500 Nothing fancy happend here either. Non of the test boxes have anything from Norton installed, they doesn't have any firewalls running (nor does the Lync server), all fences are down in this environment just for the testing. Is there any thing that I may have missed to improve the quality of this? Thanks

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• Prevalence of WMI enabled in real Windows Server networks

  - by TripleAntigen

  Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that could benefit from the features of WMI, but I noted after creating a virtual network based on Server 2008 R2, that WMI seems to be disabled by default. Do systems admins in practical corporate networks enable WMI? Or is it usually disabled for security purposes? What is it used for if it is enabled? Thanks for any advice! MORE INFO: I should have said, I really need to be able to query the workstations but I understand that by default the WMI ports on Win7 and XP firewalls (at least) are disallowed, so do you use some sort of group policy or other method to leave a hole open for WMI on the workstations? Or is just the servers that are of interest? Thanks for the responses!!

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• Have two exchange servers to communicate together

  - by Data-Base

  We have Exchange Server 2007 using our domain ddd.com. We created an isolated network with a firewall/gateway and installed a DC and Exchange Server 2010 using a demo/test domain (ddd.loc). We opened all the needed ports in the firewall (10.10.2.88) to the Exchange Server 2010. In our main Domain Controller (10.10.2.3) we defined the domain ddd.loc with IP 10.10.2.88 (firewalls). We also we defined MX records to the same IP (10.10.2.88) We did that so when we send email from my email [email protected] it will go to the Exchange Server 2010. Anyways, all the pings test from to any servers are OK. But we are not able to send or receive emails. Between these Exchange Servers we can not send any email from the 2010 to any email in general (emails are pending). Also, in Exchange 2007 we are getting error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

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• TS connection lost but not local

  - by Owl

  I have an office that is connected to a shared db server and terminal services server, that other offices use as well, through a vpn tunnel. For some reason all workstations in the office will lose connectivity to the remote address but will remain connected to their local internet. I have checked both firewalls to ensure all settings match accordingly. They seem to go down at routine times every day and it doesn't last longer than a minute or two. Any ideas of what this may be? OS: Windows Server 2003R2 Terminal Services 5.2 Symantec Gateway 320 & Symantec Firewall/VPN 100

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• Hyper-V and host-installed hardware devices: can guest VMs access?

  - by gravyface

  Have a couple of servers I'd like to setup as Hyper-V Servers, with a couple of Windows 2008 Standard VMs. On the host, we have a few hardware devices we'd like to be accessible to the guest; I'm not sure if these are supported via a raw "pass-thru" on Hyper-V (which I don't have alot of experience with) if the same drivers are installed on the guest. Hardware in question is a Brooktrout fax card, a SCSI adapter for the tape drive, and a 9-pin serial connected to one of the core firewalls for management.

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• How did Google get on my Mac?

  - by SamGoody

  Am running a MacBook Pro, and have never installed Chrome, Google Earth, or anything blatantly Google. Just installed Little Snitch (are there no good free firewalls for Mac?) and see that CURL is sending to Google every few minutes, as is a request to Google update and more. Little Snitch doesn't say what program setup these requests. So, how do I find out how G got on my machine, why is it sending so many requests (every minute or so) and how do I remove it (and is it there for reasons other than to help G spy on me)?

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• Which linux x86 hardware keystore?

  - by byeo

  I'm terminating SSL/TLS in my DMZ and I have to assume that machine will be hacked. At which point my certificates are compromised. Previously I've used nCipher hardware keystore/accelerator to solve this issue. These cards won't reveal the private key even to root. The card performs the encryption and decryption onboard and is hardened against physical attack. The only way to get at the keys is by attaching a smart card reader to the card itself. I'm having trouble finding information about something to recreate this approach. Is this the domain of specialist switches and firewalls these days? This old page references some of the old hardware: http://www.kegel.com/ssl/hw.html#cards

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• WLC 4400. Get IP

  - by Edward Connelly

  I have three SSID. one is a guest network and I'm having problems with lease times. Its set for web authentication so it passes IPs out even if someone doesn't try and authenticate. Is there a way to get that IP back and not hand another to that mac for a period of time? Poor planning and we didn't allocate enough address space, and we are sandwitched. We could go with another address, but we would have to reconfig lots. since its guest its vlan'd with no access to anthing but the firewalls. would have to change ACLs and routes and interfaces. if it isn't possible we will just have to go that route, just thought there might be an easier solution. session timeout is enabled with 1 hr lease time is set to 4 hrs. no helper DHCP and internal DHCP is set with the space split across three WLCs (60 waps split across those as well).

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• Cannot connect to apache web server over internet

  - by user1658093

  I can access my apache 2.2 webserver from the lan ( at this case I use local IP aadress ) but I cannot connect externally ( from another network ). I changed apache to listen port 800, forwarded same port from router control panel, turned off windows and router firewalls. I use whatsmyip.com to get IP with what I try to connect. When I'm trying to connect I use : [whatsmyip.com IP]:800. Also, I can ping server IP externally. OS is windows7. Any ideas, suggestions? Thanks

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• SSH reverse tunnel to monitor and manage remote devices

  - by acid_crucifix

  I have a set a distributed set of devices running Ubuntu 12.04 that I am distributing to clients. I would like to manage them remotely. They may not have fixed IPs and potentially might be behind firewalls. What I am planning to do is have the devices (permanently connected to the net) poll a request URL and based on the response open a reverse tunnel to my server, so that I can access them via that tunnel. Most of what I read about reverse tunnel over SSH is for single use cases and very little about heavy production usage. Is there some reason for this, security issues? or stability? Any help would be much obliged.

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• Utility to listen on port (Windows 2003 Server)

  - by Gero

  Hi, I need to validate some network connectivity from machine X to a Windows 2003 Server machine. To be able to do so I'm looking for a simple utility that I can run on the Windows 2003 server that will listen on a specified port. It does not have to do anything else. When it listens on the specified port I can do a telnet to that port from machine X and check if all firewalls are open. The Windows 2003 Server machine is already a production machine so I cannot install all kinds of stuff. At this stage we want to ensure that all network connectivity is in place before we do the installation of the 'real' application that will listen that port (don't want to wast time debugging network connectivity issues when we do the actual deployment of the new application. The utility should be a simple command line utility that does not require any installation. What utilities do you recommend? Thanks, Gero

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• Opening firewall to incoming port 443

  - by jrdioko

  I recently set up the ufw firewall on a Linux machine so that outgoing connections are allowed, incoming connections are denied, and denied connections are logged. This seems to work fine for most cases, but I see many denied connections that are incoming on port 443 (many with IPs associated with Facebook). I can open that port to incoming connections, but first wanted to ask what these could be. Shouldn't HTTPS requests be initiated by me and be treated as outbound, not inbound connections? Is it typical to open incoming port 443 on consumer firewalls?

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• Windows 8.1 VPN Connection Crash

  - by Anthony Russell

  I am attempting to connect to a VPN that I have used for quite some time. I followed these instructions to setup my VPN on both my desktop and my surface pro Both my desktop and surface pro have all of the current updates for Windows 8.1. However, my surface pro connects to the VPN without issue and my desktop crashes when I attempt to do ANYTHING VPN related. If I Attempt to connect to a VPN it freezes and crashes without error as soon as I hit connect Attempt to remove a VPN it freezes and crashes without error as soon as I hit remove Attempt to connect to a newly created VPN it freezes and crashes without error as soon as I hit connect I have tried disabling all Windows Firewall proticols. I have tried disabling the Windows Defender antimalware shenanigans I have no other antimalware, virus or firewalls on this machine. I am at a loss on how to fix this so any insight is appreciated.

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• Can't access internet even though everything is working

  - by entity64

  A friend recently upgraded to a new cable internet connection. The modem connects to the router and various PCs and smartphones from her roommates connect to the router. They don't have any problem accessing the internet. She has Windows 8 and can't access any website (via wifi and ethernet). DNS (UDP) is working, DHCP set up everything correctly, Wifi is working, Trace routes and Pings (ICMP) go through with no problem at all. But neither Dropbox nor Skype nor Spotify nor any browser (all TCP) can access any website. The thing is though, she can connect through the university wifi and via a neighbors wifi. It's just her home connection. No firewalls are running and the computer is clean - no malware. How could it be that only her home connection won't work and others do?

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• Hopping a VPN Tunnel

  - by lellouch

  My central office and remote offices are connected to each other over site to site ipsec vpn. We use Fortigate firewalls and everything is working fine. On the other hand, only central office is also connected to another company's network over ipsec vpn as well. In this situation, everything is also fine and employees at the central office is able to reach the other company's resources without problem. Now i want the employees working on our remote office can reach the other company's network over central office without creating new vpn tunnels. http://imgur.com/ozrXfGv How can i do that? Thanks for your answers in advance.

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• Connecting to iSCSI Target

  - by Joost Verdaasdonk

  I've installed Microsoft iSCSI Software Target 3.3 on a server 2008 R2 machine and created a new iSCSI Target. In the target I created a new Virtual Disk. From another server I started iSCSI Initiator and in Targets | Target I typed the IP of the Target. (Also tried DNS name.) But when I click Refresh I never see the target. Through googling I found this Youtube tut from a French guy doing pretty much what I did (only difference is I'm in a domain). I first though that maybe Port 3260 was closed but its not I can telnet to it. Also disabled all firewalls to see if that was blocking anything... No luck so far. Does anybody know of possible reasons why I can't connect to the iSCSI Target? If I can provide more info please let me know what's needed? Extra info: I've used this tut to set things up.

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• Mitigating the 'firesheep' attack at the network layer?

  - by pobk

  What are the sysadmin's thoughts on mitigating the 'firesheep' attack for servers they manage? Firesheep is a new firefox extension that allows anyone who installs it to sidejack session it can discover. It does it's discovery by sniffing packets on the network and looking for session cookies from known sites. It is relatively easy to write plugins for the extension to listen for cookies from additional sites. From a systems/network perspective, we've discussed the possibility of encrypting the whole site, but this introduces additional load on servers and screws with site-indexing, assets and general performance. One option we've investigated is to use our firewalls to do SSL Offload, but as I mentioned earlier, this would require all of the site to be encrypted. What's the general thoughts on protecting against this attack vector? I've asked a similar question on StackOverflow, however, it would be interesting to see what the systems engineers thought.

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• Hyper-V and host-installed hardware devices: can guest VMs access?

  - by gravyface

  Have a couple of servers I'd like to setup as Hyper-V Servers, with a couple of Windows 2008 Standard VMs. On the host, we have a few hardware devices we'd like to be accessible to the guest; I'm not sure if these are supported via a raw "pass-thru" on Hyper-V (which I don't have a lot of experience with) if the same drivers are installed on the guest. Hardware in question is a Brooktrout fax card, a SCSI adapter for the tape drive, and a 9-pin serial connected to one of the core firewalls for management.

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• JBoss behind NAT hostname problem

  - by z0mbix

  My company has a JBoss cluster sitting behind a firewall that performs NAT. We forward ports to JBoss from the firewall, so that our client application can access the server. We are having trouble when JBoss replies it tells the clients to connect to the internal hostname, not the external one with which the initial connection was made. Is this something that is easily resolved/configured? How are other JBoss app servers configured behind NAT firewalls? Split-horizon DNS? Many Thanks

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• Looking for a VPN server that fits my needs

  - by BCS

  This question (and some more research) has revealed that OpenVPN isn't for me. So, what are my other options? In particular things I need/want (most important first) are: A server daemon that runs on Linux without kernel modules Clients work from behind NATs and Firewalls. Free/FOSS Support for PPTP, L2TP or L2TP/IPSec PSK/CRT A architecture that makes all accesses equal: if the server is to have access to the VPN, then it must be a client. Just like everyone else. Minimal configuration/state. The first 3 are must haves and the last is a nice to have. The rest I could live without, but then again I could also live with nothing.

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• Searching Objects on SonicWALL (NSA 2600, SonicOS 6.1)

  - by Justin Scott

  Ok, this may sound like a dumb question, but does the SonicOS web interface not have a search option for object definitions? One of my clients recently decided to replace their Astaro Security Gateways with SonicWALL firewalls. These sit in front of a small data center full of servers and we have several hundred custom service and address definitions that need to be ported. The SonicOS interface provides a basic list for service and address definitions but no search option to be found. To make it worse, there is no option to list them all on one page (they're paginated 50 at a time) so I can't use the text search on the web browser either. The Astaro units have a nice search option on their definitions so perhaps I just got spoiled by their software. Am I missing something or is there some way to search for an object without paging through the list and finding an entry manually?

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• Is there a way to use something like RewriteRule ... [PT] for an external URL?

  - by nbolton

  I have a non-apache web server running on port 8000, but this cannot be accessed from behind corporate firewalls. So, I would like to use my apache 2 server as a proxy to this other web server. I've tried using: RewriteEngine On RewriteRule /.* http://buildbot.synergy-foss.org:8000/builders/ [PT] ... but this does not work; I get: Bad Request Your browser sent a request that this server could not understand. However, it worked fine with [R]. Update: Also, when using ProxyPass, I get this error: Forbidden You don't have permission to access / on this server.

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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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• Workgroup connection: You may not have permission

  - by Afiefh

  I have two Windows XP computers connected through an Ad-Hoc network, computer A creates the network and B connects to it. Both computers are on the Mshome network and have file and printer sharing enabled, and they can ping one another through the adhoc network. The result is that computer A can see computer B, but B cannot see A in the workgroup. But when A tries to access B I get a "you might not have permission to access" error telling me to contact the administrator. I tries to google the error, but most posts talk about problems connecting different versions of Windows to each other. I tried turning off the firewalls on both machines and checking if the required services are running. Nothing helped. Please excuse my ignorance on Windows networking, I haven't used Windows in around 10 years.

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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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