Built-in Firewall and Blocking of Dreamweaver

When I turn on the automatic firewall in Sharing Preferences (OS 10.4.11) my uploads to a remote server through Dreamweaver MX are blocked. Is there a way to open the Firewall to allow these uploads? Thanks for any suggestions.

Hi Kaplan,
Have you enabled ftp in the Sharing Pref Pane?
There are two main types of FTP are active and passive. In active FTP, the FTP server initiates a data transfer connection back to the client. For passive FTP, the connection is initiated from the FTP client.
Different Ports need opening for the two, this is for Linux, but applies to any ftp...
http://www.linuxhomenetworking.com/wiki/index.php/QuickHOWTO_:_Ch15_:_Linux_FTP_ServerSetup

Similar Messages

Windows 7 Built-In Firewall Filtering Platform Blocking Outlook.exe Even Though Firewall Off

(this post was originally started here,
http://answers.microsoft.com/en-us/office/forum/office_2010-outlook/windows-7-built-in-firewall-filtering-platform/7312a367-3a9f-470a-b6c7-56c041630af1, but recommended to move to this forum)
I first encountered this problem on a Windows 7 computer running Outlook 2007 a couple of weeks ago. The system kept asking the primary user for a password to connect to our Exchange Service. The user kept typing in the correct password, but it would never
connect. Using Outlook Web Access from the same computer with the same user and password was successful, so the credentials and network connection seemed good.
After checking the Security Logs, I found pairs of Event 5152 and 5157 whenever the user tried to enter a password. Example events are listed below (although they are from the most recent incidence). I found out that the Filtering Platform is supposed to
be part of Windows Firewall, but couldn't find much other information about it. However, the Windows Firewall is turned off by Group Policy (verified by looking in the Control Panel for Window Firewall), so I didn't think it should be blocking anything. Oddly
enough, the Windows Firewall service was running on this computer, but it was running on all computers, even if they didn't have this problem.
I found that I could make the problem go away by stopping the Windows Firewall service. However, it seems odd that would be necessary. It seems a bit of a kludgy fix.
I hoped that the problem would only by on one system and could let it go for a bit. Unfortunately, I just had the problem crop up on a new Windows 7 system with Outlook 2010 installed.
At this point, I'm concerned about what might be causing it and that it might start happening on all our systems. I could stop the Windows Firewall service on all of them, but I'd like to understand what might be happening more before taking that action.
For reference, both systems have received all Automatic Updates and are running the McAfee Total Protection Service anti-virus and firewall services.
Any thoughts or suggestions would be appreciated.
Thanks in advance,
indyvql
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          3/9/2015 9:05:38 AM
Event ID:      5152
Task Category: Filtering Platform Packet Drop
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      usercomputer.domain.com
Description:
The Windows Filtering Platform has blocked a packet.
Application Information:
Process ID:  10712
Application Name: \device\harddiskvolume3\program files\microsoft office\office14\outlook.exe
Network Information:
Direction:  Outbound
Source Address:  <IP Address of User Computer>
Source Port:  55279
Destination Address: <Unknown IP Address in 192.168 Subnet, Which is Not Used By Us>
Destination Port:  443
Protocol:  6
Filter Information:
Filter Run-Time ID: 67045
Layer Name:  Connect
Layer Run-Time ID: 48
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          3/9/2015 9:05:38 AM
Event ID:      5157
Task Category: Filtering Platform Connection
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      usercomputer.domain.com
Description:
The Windows Filtering Platform has blocked a connection.
Application Information:
Process ID:  10712
Application Name: \device\harddiskvolume3\program files\microsoft office\office14\outlook.exe
Network Information:
Direction:  Outbound
Source Address:  <IP Address of User Computer>
Source Port:  55279
Destination Address: <Unknown IP Address in 192.168 Subnet, Which is Not Used By Us>
Destination Port:  443
Protocol:  6
Filter Information:
Filter Run-Time ID: 67045
Layer Name:  Connect
Layer Run-Time ID: 48

Hi indyvql,
"..are running the McAfee Total Protection Service anti-virus and firewall services."
- So you've enabled McAfee firewall? If you have McAfee firewall turned on, then everything is managed by McAfee Personal Firewall which might cause the issue.
To troubleshoot the issue, I would suggest we first disable McAfee temporarily, then try again.
Also, as you've mentioned, please go ahead to have a test with just updating McAfee but not stopping the Windows Firewall service, then verify result.
Regards,
Ethan Hua
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

How to create a new rule in Windows Firewall to permit some specific IPs and block all other computers

Hello,
I have a Win7 PC. I want to block all incoming connections except 3 or 4 IPs. How can i do this?
I created a new rule to block all connections using this steps:
Inbound rules > New Rule > Custom > All Programs > All Protocols / Ports > All Local/Remote IPs > Block the connectiion > All profiles > Then i gave a name
This rule works fine and blocks all incoming connections.
Then i want to create a new rule to allow specific IPs using this steps:
Inbound rules > New Rule > Custom > All Programs > All Protocols / Ports > Remote IPs: 192.168.10.5, 192.168.10.10 > Allow the connection > All profiles > Then i gave a name
But 192.168.10.5 and 192.168.10.10 couldn't reach W7 machine.
(If rules are disabled or FW is off; both IPs could reach W7 machine)
Thanks

Hi,
How did you check these two IP address? Through remote access? According to your description, it should only allow remote IP could access this computer. Please also allow local IP for test.
Roger Lu
TechNet Community Support

Windows Firewall and Windows Update (Win 8.1)

Since Windows Vista I have always been using the Windows Firewall with "blocked outgoing traffic". As this is not the default setting, some basic windows services seem not to be included as firewall rules on the outgoing side.
My Problem is with the Windows Update:
On Windows Vista and 7 it was sufficient to create a rule for "wuauserv".
On Windows 8.1 however this seems not to be enough. The UI gives me error code 80240438 and the WindowsUpdate.log shows the following lines:
2014-06-14   20:11:08:150   952   538   IdleTmr   WU operation (CAgentProtocolTalker::SyncUpdates_WithRecover) started; operation # 2044; does use network; is at background
priority
2014-06-14   20:11:08:151   952   538   WS   WARNING: Nws Failure: errorCode=0x803d0010
2014-06-14   20:11:08:151   952   538   WS   WARNING: Original error code: 0x80072efd
2014-06-14   20:11:08:151   952   538   WS   WARNING: Fehler bei der Kommunikation mit dem Endpunkt bei "https://fe2.update.microsoft.com/v6/ClientWebService/client.asmx".
2014-06-14   20:11:08:151   952   538   WS   WARNING: Fehler beim Senden der HTTP-Anforderung.
2014-06-14   20:11:08:151   952   538   WS   WARNING: Der Remoteendpunkt konnte nicht erreicht werden.
(.... and a lot of similar WARNING lines)
2014-06-14   20:11:12:921   952   538   IdleTmr   WU operation (CAgentProtocolTalker::SyncUpdates_WithRecover, operation # 2044) stopped; does use network; is at background
priority
If I create a rule for the whole svchost.exe, the update works fine. Giving all services internet access is however not an option for me. Could you please tell me through which service(s) except wuauserv Windows Update performs its network activities?

Windows 8 upgraded to 8.1 on a Gateway SX2370.  Purchased Sep. 2013.
As of Dec. 28, 2014 I have not gotten ANY windows defender updates and windows update has not been working at all. When I go to my start screen and type "update" Windows update still shows in the list, only now when I click on it, it brings
up a blank window and can only be closed by right clicking the tab on the taskbar. I cannot max or minimize the window either.
Up until Dec. 28th it was working perfectly, notifying me when updates were available, almost everyday for windows defender.
I have tried everything I could find to fix this, even a complete restore, with recovery media made for Win 8.1 and Win 8. Still no windows updates, of anything. To top it off as of Jan. 22, 2015 the Diagnostic Policy Service has stopped and I am denied
access when I try restarting it.
Windows XP was great until MS stopped support. Vista sucked, near as bad as Millenium or 2000. I never tried windows 7 instead going for windows 8, being the most recent version when I could afford a new PC. Adapting to win 8-8.1 was no easy task.
I'm not a tech guru, but I've owned & used windows from Dos 6.0, '95, '98, '98SE, Millenium, XP, XP home & Pro (sp1-2 & 3) and still have the installation/restore CDs for all of them. Even taught myself how to write the recovery
console directly from the hard drive of XP, OEM or full MS versions without using the CDs & now I'm using Windows 8 - 8.1. Getting rid of the recovery console was a BIG mistake in my opinion.
At one time I had a multi-boot system of win.95, 98, 98SE, Mill., XP home sp2 and XP Pro sp3 on a 1.5 TB self built system. Microsoft told me it was impossible, until I allowed two tech support reps remote access for 5 min.. Which also lead to me being
blocked from most MS websites &?suggestions windows forums for 3 years.
But so far, this failure of windows updates and the Diagnostic policy Service in Windows 8.1 has got me stumped. Can ANYONE give me a quick simple way to correct this? Please?
Thanks for reading this and any help or suggestions anyone has to offer. GOD bless you all and my thanks to every military person, their families and veterans for my freedom.

Mac OS X firewall and Java.

Hello,
1) I am using the built in firewall 10.5.8, and I was wondering what functionality I will lose if I select "Block Incoming Connections" for "java".
2) If "Block Incoming Connections" is selected, for a specific program (java), does that mean that the program (java) will not respond to connections that the program itself opens? I guess I am asking if the software firewall is a NAT/SPI based firewall.
3) The icon to the left of "java" looks weird to me. Is is everyone else seeing the same icon? Here is a link to the image: http://gallery.me.com/zap1313#100057/firewall&bgcolor=black
Thanks

1) I am using the built in firewall 10.5.8, and I was wondering what functionality I will lose if I select "Block Incoming Connections" for "java".
That depends on what Java applications you're running.
2) If "Block Incoming Connections" is selected, for a specific program (java), does that mean that the program (java) will not respond to connections that the program itself opens?
It has no effect on outgoing connections initiated by the application.
3) The icon to the left of "java" looks weird to me. Is is everyone else seeing the same icon? Here is a link to the image: http://gallery.me.com/zap1313#100057/firewall&bgcolor=black
The icon looks normal to me. Java isn't a typical double-clickable application, so it appears as the generic console application icon.

[nForce] K7N2 Delta Platinum built in firewall, advice?

Ok... well how many of you are using this built in firewall?
I have obtained two versions
Network management tools version 4.57 from the 6.11 package
and
Network management tools version 4.66 from the 6.37 package
currently I am using zone alarm and I am satisfied but some of the programs I use (dc++) do not like zone alaram
so some od the downloaded files are corrupt (skipping mp3s and corrupted zip files)
to conclude I would like to know are you people that are using this (nforce) firewall satisifed?
and which one should I install?

The firewall uses a technology called SPI, stateful packet inspection.
Every packet that comes in is checked for a few things,
Like your IP address inside the packet. (destination of the packet)
If you IP address is not there then the packet is blocked.
This type of firewall is very secure but unlike software firewalls you do not have
application filtering.
The SPI firewall allows a program through the firewall or blocks it.
A good software firewall allows the program + you specify the ports for that program.
With the SPI one if you specify a port it will open a hole in the firewall and allow
anything to come in/out.
Do you see how the software one is more flexible?
Apart from that the firewall does work, I use it with a NAT based firewall in my router.
If you are downloading / using P2p programs the software firewall is much better, The firewall can cause some P2P programs to freeze.
A few people experience terrible problems with the firewall, random crashes/BSODs.
No one knows why yet.
The nvidia website has a lot of info about the firewall too.
http://www.nvidia.com/object/feature_activearmor.html
http://www.nvidia.com/object/IO_16451.html
http://www.nvidia.com/object/IO_13034.html
Your one does not have active armour but the firewall is exactly the same.
Now you should check your memory.
The best advice in the world and you choose to ignore it.

Problem with firewall and java on line sites internet explorer

i have been experiencing problems with java on line games because the firewall has blocked usage.On two of them when i press play to play the game a message appears error on page.If i dowload mozilla will i have the same problems? also when downloading from my gmail account again error on page. When i donload your browser do i click on save or open?
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; WinNT-EVI 27.03.2010)

Well... good; when we help each other here, we can't
assume that any step has been taken, unless it's been
specifically identified. I'm sure that makes it all
the more frustrating, since you are a very experienced
user.
Now, then:
-- since you have reinstalled the Java Update; and
-- if you open your Help >> Installed Plug-ins, and
scroll down the list and find these three items:
Java Plug-in for Cocoa -- Java 1.4.2 "JavaPluginCocoa.bundle"
Java Plug-in (CFM) -- Java 1.3.1 "Java Applet Plugin Enabler"
Java Plug-in "Java Applet.plugin"
-- and if Enable Java and Enable JavaScript are checked in:
Safari >> Preferences >> Security, as you say they are; and
-- if Enable Plug-ins is checked in the same section,
as you say it is; and
-- you have repaired permissions, as you say you have; and
-- you have emptied your Cache; and
-- your Icons folder ({YOU}/Library/Safari/Icons) has been
trashed if it is over 750 KB; and
-- you have Quit, then relaunched Safari after all this,
as you say you have; and
-- your {YOU}/Library/Caches and {YOU}/Library/Caches/Safari
folders have read and write permissions
...then, I'm currently at a loss as to what else to suggest.

I am trying to install Kodak printer ESP C310 but it says a firewall is blocking the installation. Can you help?

I am trying to install Kodak printer ESP C310 but it says a firewall is blocking the installation. Can you help?I am using windows XP. I have searched port 5353 and this is enabling Bonjour.

You could check this article, but it is about Firefox itself not having access.
: http://kb.mozillazine.org/Firewalls
Could you provide the exact wording and punctuation of the message, and try Googling that yourself -- when you google leave out unimportant words and punctuations, group words that are still together as in original message within quotes or with hyphens so that google will look for those words together in that order.

Error message about firewall and internet sharing

hello all i have a question regarding the use of firewall and internet sharing.
I have a PMG5 connected to internet through Airport. I've linked an Xbox 360 via the built-in ethernet port in order to access Xbox Live. I had to open specific UDP ports on the OS X firewall but it now works fine. However, in the Sharing Preference Pane, Internet Tab, i still get an error message saying that my Internet Sharing is disturbed by the settings of the firewall and sharing services, it says that i did not activate "personal web sharing" in the first two tabs...but i DID ! And there's no way to get rid of this error message.
I know I know some may consider it's not a real problem because it's just an error message while the connection actually works fine but well, I tend to hate error messages when they're not supposed to show up. So if anyone know the answer, thanks in advance...
Good day to everyone
Vince, Paris...

sorry about the delay in replying, was kinda busy
well trashing the pref files was useless and i tried with another user, same thing. As for the second opinion, the problem was not about which port was used cause as i said the connection sharing works fine and anyway it was the correct port that was checked, it's just that i get an error message while there is no apparent error and everything works fine, i'm told that personal web sharing is not enabled but it is...
Anyway as i said, it's probably not a real matter, as long as it works...which brings me to another thing. I've created a special protocol in the firewall to enable a proper dialog with the xbox. it's basically the same thing you do for ichat AV when you have video connection problems, you track down the concerned UDP port using terminal, you allow traffic and all... The protocol for the xbox worked great for some days, but now it seems it's not enough, the game set keeps trying on another port and i constantly have to update the protocol or deactivate the firewall...and enabling back all UDP traffic is not enough to solve it.
In a way i think everything is linked, the initial error message when everything was fine and the current trouble. Any idea?
thanks
Vince

Help with Firewall and Internet Sharing

I’m trying to use my Mac Mini with an Airport Extreme card, which is connected to the internet using Siemens Speedstream 4100 DSL modem, for Internet Sharing with a Windows (work) laptop.
So, in the Sharing preferences panel:
Share connection from: Built in Ethernet
To computers using: Airport
I get the warning message:
Other settings may interfere with Internet Sharing.
The ‘More Info’ button gives the popup message:
Your firewall settings will prevent computers sharing your internet connection from browsing the web. Enable Personal Web Sharing in the Services pane to allow computers sharing your connection to browse the web.
I do that, turn the Airport card on, and the laptop can see the network, but can’t connect.
If I turn the Firewall off, then I can connect fine, but then I don’t have a Firewall. Isn’t that risky if I’m using DSL? How can I do the internet sharing and still protect my computer?
I realize I could buy a router with a built-in firewall, but isn’t there a way to set up the system using what I have?

BDAqua wrote:
We just need to figure out what port is needed. I'd goto Sharing>Firewall>New>Port Name... Other, and try Port 53 both UDP and TCP.
Oh, and when you say the PC can't connect, could that just mean it can't browse?
On the PC, put the IP of the Mac in DNS servers, or...
208.67.222.222
208.67.220.22
Well, I'm unable to set the DNS server addresses, as this is a work computer and I don't have the administrative privileges.
How bad is it to just turn the Firewall on the Mac off when I want to use the connection?

Firewall is blocking SSH when it shouldn't be

I had a [problem with SSH|http://discussions.apple.com/thread.jspa?threadID=1990417&tstart=0] on my iMac not long ago where SSH was being blocked by the Leopard firewall, even though it is configured to allow it through. I have the firewall configured as "Set access for specific services and applications" and "Remote Login (SSH)" appears on the list automatically since Remote Login is enabled on the Sharing tab of System Prefs.
The first time I had the problem I solved the problem by turning off the Leopard firewall ("allow all incoming") and then turning it back on again (in "specific services" mode). I thought it was just a one time glitch being the first time I'd ever tried getting SSH to work. After that it worked great until restarting my iMac yesterday when the firewall started blocking SSH again. Once again, turning off the firewall and then turning it back on again resolved the problem.
Any ideas? Anyone had similar problems?

Most routers thesedays even consumer routers have a stateful packet inspection firewall and also NAT.
With NAT unless you specifically open ports from the router to your mac then the outside world cannot access any of the services on your mac.
If you want to use SSH from the outside world then you would have to portforward tcp port 22 from the router to your mac. But this is not a problem if you use a strong password eg not a dictionary word or name or better still you can turn off password authentication in your ssh configuration and use public key access only.
So if you have not opened up ports on the router then your application firewall is only preventing access from other computers on your local network.
Call me paranoid, but I don't know anything about how solid the router firewall is, whereas I have much more confidence in the OS X firewall.
If you are savvy enough to know about and how to use SSH then it should be really easy for you to find out how good your router's firewall is. Understanding a router's web interface is far less demanding than learning how to use SSH.
In most cases you simply put the router's IP address into your web browser and you can see all of its services.
But something you should be aware of it is not really incoming connections you should be concerned about. It is outgoing connections that require more control.
For example if you were socially engineered by a website or elsewhere and they convinced you to install a trojan or spyware on your mac then your Mac's Application firewall would not stop these processes dialing out.
Little Snitch from obdev is an application aware firewall that controls your outgoing connections and is far more useful than the mac's application firewall on a desktop computer behind a router.
Apart from that, I'd really like to understand what's going on!
Did you try nerowolfe's suggestion of creating a test user account and login in as that user and see if the problem is still there?

Firewall and mysql startup sep questions

is there anyway to make mysql server start on boot up so i don't have to leave a user logged in for sql to work.
On another note, firewall is blocking ftp access when truned on how do i sort it?

Under "My Music" I have the following type of folder structure:
Music A-D<<Artist> (around 00 artists)<<Album> (around 300 albums)<MP3 Files...(around 6000 songs)<
Music E-I<<Artist> (around 00 artists)<<Album> (around 300 albums)<MP3 Files...(around 6000 songs)<
Music J-R<<Artist> (around 200 artists)<<Album> (around 600 albums)<MP3 Files...(around 2000 songs)<
Music S-Z<<Artist> (around 00 artists)<<Album> (around 300 albums)<MP3 Files...(around 6000 songs)<
Various Artists<<Artist> (around 500 artists)<MP3 Files...(around 8000 songs)<
Dump Folder<MP3 Files (unsorted, about 8000 files)<
I have Media Sniffer setup to monitor "My Music" and all the folders underneath it. Weird thing is that if by turning off Media Sniffer, if my startup performance lag goes away, that indicates that Media Sniffer is doing a folder check during startup. I can't imagine that I'm the only person who has their music library organized into a logical folder structure - most ripping programs today allow you to do this?by default. Heck, even media ripping services that you send your CDs to in bulk send files back this way.
Also, my media library is?static right now - I'm haven't added any files to my library in months (got a little burned out organizing the darned things). So Media Sniffer shouldn't have to exert itself in searching for new files (I assume its smart enough to check the directory size or file count for changes before "searching" through the whole directory structure - but maybe that assumption is wrong?)

Firewall and OS X Firewall

Hi,
I try to improve my networking science knowledge. today's topic = firewall
I use only Tiger Built-in Firewall, which i think perfectly makes his job, but I also have the Intego netbarrier software which I did not install.
I am not totally sure what would be the added value of a fancy FW like Intego. Do anyone has an idea of what such product brings more than built-in and which one is the most secure?

A third-party firewall such as Intego's would offer additional reporting and other features, while the underlying protection is pretty much the same as OS X's built-in firewall. Personally, I'd trust the OS X built-in firewall more as being more likely to be fully integrated with the OS and aware of any OS X updates. In an analogy with Windows, the one thing you should avoid is having multiple software firewalls active at the same time --- too much potential for one program deciding the other is evil and trampling things trying to 'fix' the other.
You can, through, combine a software firewall with a hardware one. All routers currently n the market should have at least a NAT firewall. Even if you only have one computer, putting a US$30 router between a cable or DSL modem and the computer gives you additional protection. And unlike e.g. a Windows third-party software firewall, the hardware firewall can't be tricked into turning off.

So does any Linux have a built in firewall?

I hear that the Linux kernel has a firewall called iptables built in and working. How secure is it? Is it included with Arch by default? I am just wondering because there is a package called iptables in the repos...

Well, this might help you better and give you a basic understanding of the subject, http://wiki.archlinux.org/index.php/Firewalls. As far as I can tell, iptables is the only firewall linux has, and is as powerful and secure as you make it. I have been using shorewall, which is another application for managing iptables in an easy more logical way, for managing my iptables firewall and my firewall pass the shields up! test with perfect stealth, so it really can be secure.

DASYLAB QUERIES on Sampling Rate and Block Size

HELP!!!! I have been dwelling on DASYLAB for a few weeks regarding certain problems faced, yet hasn't come to any conclusion. Hope that someone would be able to help.Lots of thanks!
1. I need to have more data points, thus I increase the sampling rate(SR). When sampling rate is increased, Block size(BS) will increase correspondingly.
For low sampling rate (SR<100Hz) and Block size of 1, the recorded time in dasy and the real experimental time is the same. But problem starts when SR>100Hz for BS=1. I realized that the recorded time in dasylab differs from the real time. To solve the time difference problem, I've decided to use "AUTO" block size.
Qn1: Is there any way to solve the time difference problem for high SR?
Qn2: For Auto Block Size, Is the recorded result in dasylab at one time moment the actual value or has it been overwritten by the value from the previous block when AUTO BS is chosen.
2. I've tried getting the result for both BS=1 and when BS is auto. Regardless of the sampling rate, the values gotten when BS=1 is always larger than that of Auto Block size. Qn1: Which is the actual result of the test?
Qn2: Is there any best combination of the block size and sampling rate that can be used?
Hope someone is able to help me with the above problem.
Thanks-a-million!!!!!
Message Edited by JasTan on 03-24-2008 05:37 AM

Generally, the DASYLab sampling rate to block size ratio should be between 2:1 and 10:1.
If your sample rate is 1000, the block size should be 500 to no smaller than 100.
Very large block sizes that encompass more than 1 second worth of data often cause display delays that frustrate users.
Very small block sizes that have less than 10 ms of data cause DASYLab to bog down.
Sample rate of 100 samples / second and a block size of 1 is going to cause DASYLab to bog down.
There are many factors that contribute to performance, or lack there of - the speed and on-board buffers of the data acquisition device, the speed, memory, and video capabilities of the computer, and the complexity of the worksheet. As a result, we cannot be more specific, other than to provide you with the rule of thumb above, and suggest that you experiment with various settings, as you have done.
Usually the only reason that you want a small block size is for closed loop control applications. My usual advice is that DASYLab control is around 1 to 10 samples/second. Much faster, and delays start to set in. If you need fast, tight control loops, there are better solutions that don't involve Microsoft Windows and DASYLab.
Q1 - without knowing more about your hardware, I cannot answer the question, but, see above. Keep the block size ratio between 2:1 and 10:1.
Q2 - without knowing more about your hardware, and the driver, I'm not sure that I can fully answer the question. In general, the DASYLab driver instructs the DAQ device driver to program the DAQ device to a certain sampling rate and buffer size. The DASYLab driver then retrieves the data from the intermediate buffers, and feeds it to the DASYLab A/D Input module. If the intermediate buffers are too small, or the sample rate exceeds the capability of the built-in buffers on the hardwar, then data might be overwritten. You should have receive warning or error messages from the driver.
Q3 - See above.
It may be that your hardware driver is not configured correctly. What DAQ device, driver, DASYLab version, and operating system are you using? How much memory do you have? How complex is your worksheet? Are you doing control?
Have you contacted your DASYLab reseller for more help? They should know your hardware better than I do.
- cj
Measurement Computing (MCC) has free technical support. Visit www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.

Built-in Firewall and Blocking of Dreamweaver

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