Tcp connection timeout
Hi
I'm using utl_tcp to send some information. My problem is, it takes approx. 21 seconds the connection to time out, when host does not exist. So no read, no write, only bulding up the connection takes 21 seconds to time out, and I want to set this to a lower value, if it is possible. I read the documentation, and googled a lot, a found some tips, that is related to sqlnet.ora, but those don't seem to work.
thanks for the answers in advance
894414 wrote:
I'm using utl_tcp to send some information. My problem is, it takes approx. 21 seconds the connection to time out, when host does not exist. So no read, no write, only bulding up the connection takes 21 seconds to time out, and I want to set this to a lower value, if it is possible. I read the documentation, and googled a lot, a found some tips, that is related to sqlnet.ora, but those don't seem to work.SQL*Net setting should not be applicable to a manual/programmatic tcp client created in PL/SQL code.
I doubt that you can do anything with increasing speed of the timeout. This is a protocol stack issue as the connect() socket call explains. The issue with PL/SQL is that async calls cannot be made - so wrapper calls like tcp sockets in PL/SQL need to be synchronous.
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How to set TCP connection timeout in solaris 9
Hello All,
I am new to solaris. While using oracle, sometimes I face tcp connection timeout.
The timeout happens after a long delay like more than 8 min. I want to reduce the tcp connection timeout to 2 min in solaris.
Please help me to change this setting.
My current configuration is
SunOS testmachine 5.9 Generic_122300-13 sun4u sparc SUNW,Sun-Fire-V440
Thanks
PurushothThere's a fair amount of tunables. Without known what is timing out (dns, lost packet...), it's hard to say what you want to tweak. The list of parameters can be seen by using ndd:
ndd /dev/tcp \?
or
ndd /dev/ip \?
and can be set by using ndd -set (see ndd(1M) ). Note that anything you set has to be reset on reboot, so you have to stick this in a script somewhere, or know what the variable translates to to stick it into /etc/system.
-r -
Does anyone know of a way to increase the TCP connection timeout on Linux (RedHat ES 3.0, 2.4.21-9.0.3.ELsmp). We currently always keep a "dead" server in our imqAddressList for failover. The server has nothing listening on the portmapper port, 7676. When I telnet over regular Internet it takes less than a second to get a connection refused response:
telnet: Unable to connect to remote host: Connection refusedWhen I telnet to this server over a low bandwidth satellite connection, I get a timeout after 3 minutes:
[root@client# time telnet server 7676
Trying X.X.X.X...
telnet: connect to address X.X.X.X: Connection timed out
real 3m15.393s
user 0m0.010s
sys 0m0.000sWe currently have 3 servers in our imqAddressList and imqReconnectAttempts is set to 0. However, since one of the 3 servers is dead, 1/3 of the time it takes over 3 minutes to get a connection. I'd imagine that the socket connection from IMQ is exhibiting the same behavior as telnet.
Is there anywhere that I can tweak this timeout?
Thanks,
AaronYou need to call connect on a socket set to non-blocking mode with fcntl, and then use select with a timeout to limit the amount of time you will wait for the connect to complete. If select returns because you timed out, then close the socket and return an error. If select returns because of an event on the socket, you use getsockopt to determine if the connect succeeded or not.
See Stevens, Unix Network Programming Vol 1 for details. Comments in the code I'm looking at say page 411.
Hope this helps. -
Hello,
our customer has a problem with correct closing TCP connections on the ACE. TCP session (HTTP protocol) is closed _correctly_ (we can see it in the sniffer output), but 'sh conn' on the ACE shows it as 'established' (session is already closed). TCP timeout is set to default (60min).
Any new connection from the same src port (because many connection to the service) is closed after TCP session is established.
When I try generate 200 concurrent sessions TCP sessions in my lab, this are on the ACE closed correctly. Customer's traffic is around 20-30.000 concurrent session, but I can't generate so much traffic.
SW version on the ACE: 3.0(0)A1(3b)
thx
martinThanks Gilles!
The problem occurs only with traffic from WAP nodes (too many short HTTP requests).
We try it upgrade to A1(5b), but I'm not sure, if this is our problem...
Bug description:
Symptom:
With L7 LB configuration, Some times connections do not close.
Conditions:
SYN sent to Real server may result in ACK coming from server. ACE TCP module was not handling this ACK correctly.
...but our traffic is only L4 LB and we have a problem with connection state on the ACE from both sides (client and server). on the client and server side is connection closed properly, but on the ACE module ('sh conn') we can see it in 'established' state. It's closed after TCP timeout and that is not correct.
martin -
Tcp Connection timeout on ASA for vpn traffic
Hello All
I need an answer please.
I wanted to give tcp conenction timeout as unlimited for some IPs coming through VPN.
So, I created an access-list defining the traffic for which I want this tcp timeout.
Then a class map, policy map, entered set timeout to '0'
Applied it under default service-policy, which is applied as global (by default).
My doubt is should I apply the service policy on the interface or the global will work.
Just a silly doubt
Thanks in advance.Hi,
I think it should work just fine if you attach it to the default "policy-map" configuration that you have attached globally on the ASA.
You might want to configure the timeout value as something long rather than setting it as unlimited.
- Jouni -
Solaris 10 pannic under High TCP connect timeout rate
Today I find one of my server is rebooted.the messages is as follows:
Dec 20 08:14:27 hosta unix: [ID 836849 kern.notice]
Dec 20 08:14:27 hosta unix: [ID 836849 kern.notice]
Dec 20 08:14:27 hosta ^Mpanic[cpu3]/thread=2a1009c3cc0:
Dec 20 08:14:27 hosta ^Mpanic[cpu3]/thread=2a1009c3cc0:
Dec 20 08:14:27 hosta unix: [ID 165833 kern.notice] CONN_DEC_REF: connp(6000656c600) has ref = 0
Dec 20 08:14:27 hosta unix: [ID 165833 kern.notice] CONN_DEC_REF: connp(6000656c600) has ref = 0
Dec 20 08:14:27 hosta unix: [ID 100000 kern.notice]
Dec 20 08:14:27 hosta unix: [ID 100000 kern.notice]
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c3420 ip:squeue_enter_chain+3a8 (60001175d80, 30013e14740, 30013e
14740, 2060, 0, 0)
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c3420 ip:squeue_enter_chain+3a8 (60001175d80, 30013e14740, 30013e
14740, 2060, 0, 0)
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 000000007beaa184 000006000656c600 0000000000000088 0000000000002069
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 000000007beaa184 000006000656c600 0000000000000088 0000000000002069
Dec 20 08:14:27 hosta %l4-7: 0000000000002060 000000007befac00 0000000000000000 000006000656c600
Dec 20 08:14:27 hosta %l4-7: 0000000000002060 000000007befac00 0000000000000000 000006000656c600
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c34d0 ip:ip_input+854 (300003bc668, 0, 0, 0, 700dbc08, 1)
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c34d0 ip:ip_input+854 (300003bc668, 0, 0, 0, 700dbc08, 1)
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 00000000e0000000 0000030013e14740 0000060001175d80
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 00000000e0000000 0000030013e14740 0000060001175d80
Dec 20 08:14:27 hosta %l4-7: 0000000000000001 00000000f0000000 0000000000000006 0000030013e14740
Dec 20 08:14:27 hosta %l4-7: 0000000000000001 00000000f0000000 0000000000000006 0000030013e14740
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c35f0 unix:putnext+218 (600012bb910, 600012bb720, 30013e14740, 10
0, 600012bb9b0, 0)
Dec 20 08:14:27 hosta genunix: [ID 723222 kern.notice] 000002a1009c35f0 unix:putnext+218 (600012bb910, 600012bb720, 30013e14740, 10
0, 600012bb9b0, 0)
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 00000000000056a0
Dec 20 08:14:27 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 00000000000056a0
Dec 20 08:14:27 hosta %l4-7: 000000000000010d 00000000700b6fb8 000000007be179b8 fffffd5eff642000
Dec 20 08:14:27 hosta %l4-7: 000000000000010d 00000000700b6fb8 000000007be179b8 fffffd5eff642000
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c36a0 pfil:pfilmodrput+2d8 (600012bb9b0, 30013e14740, 2a1009be000
, 0, 60001897df0, 3001796d000)
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c36a0 pfil:pfilmodrput+2d8 (600012bb9b0, 30013e14740, 2a1009be000
, 0, 60001897df0, 3001796d000)
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 00000000018a89b8 0000000000000001 0000000000000000 0000000000000001
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 00000000018a89b8 0000000000000001 0000000000000000 0000000000000001
Dec 20 08:14:28 hosta %l4-7: 0000000000000000 ffffffffffffffff 000000000183d5c0 0000030000fea000
Dec 20 08:14:28 hosta %l4-7: 0000000000000000 ffffffffffffffff 000000000183d5c0 0000030000fea000
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c3760 unix:putnext+218 (600012bbba0, 600012bb9b0, 30013e14740, 10
0, 600012baf70, 0)
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c3760 unix:putnext+218 (600012bbba0, 600012bb9b0, 30013e14740, 10
0, 600012baf70, 0)
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 0000000000005810
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 0000000000005810
Dec 20 08:14:28 hosta %l4-7: 000000000000010d 00000000703afb48 000000007bb9c33c fffffd5eff642000
Dec 20 08:14:28 hosta %l4-7: 000000000000010d 00000000703afb48 000000007bb9c33c fffffd5eff642000
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c3810 ce:ce_drain_fifo+52c0 (1, 30013e14740, 600013b6f00, 7bb9777
c, 7bb97b80, 3000ea29d02)
Dec 20 08:14:28 hosta genunix: [ID 723222 kern.notice] 000002a1009c3810 ce:ce_drain_fifo+52c0 (1, 30013e14740, 600013b6f00, 7bb9777
c, 7bb97b80, 3000ea29d02)
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000008100 00000600012baf70 0000000000000000 00000000010b6cc8
Dec 20 08:14:28 hosta genunix: [ID 179002 kern.notice] %l0-3: 0000000000008100 00000600012baf70 0000000000000000 00000000010b6cc8
Dec 20 08:14:28 hosta %l4-7: 0000000000000000 000000007bb98174 000000000105e320 00000600012cd1a0
Dec 20 08:14:28 hosta %l4-7: 0000000000000000 000000007bb98174 000000000105e320 00000600012cd1a0
Dec 20 08:14:28 hosta unix: [ID 100000 kern.notice]
Dec 20 08:14:28 hosta unix: [ID 100000 kern.notice]
Dec 20 08:14:28 hosta genunix: [ID 672855 kern.notice] syncing file systems...
Dec 20 08:14:28 hosta genunix: [ID 672855 kern.notice] syncing file systems...
Dec 20 08:14:29 hosta genunix: [ID 733762 kern.notice] 4
Dec 20 08:14:29 hosta genunix: [ID 733762 kern.notice] 4
I found "http://sunsolve.sun.com/search/document.do?assetkey=1-26-102551-1",but I already applied this patch.any suggestion?
I suffered this problem for 2days,the server reboot three or four times one day.sorry for my poor English.If you have a support contract then file a bug report. Also be sure to tell them that you have already applied the corrective patch and list the patch number.
This is why the last two digits are allowed to go up sequentially.
alan -
Hi all,
I am new to the world of labview and am attempting to build a VI which sends commands to a 750-881 WAGO controller at periodic intervals of 10ms.
To set each of the DO's of the WAGO at once I therefore attempt to send the Modbus fc15 command every 10ms using the standard Labview TCP write module.
When I run the VI it works for about a minute before I recieve an Error 56 message telling me the TCP connection has timed out. Thinking this strange, I decided to record the number of bytes sent via the TCP connection whilst running the program. In doing so I noticed that the connection broke after exactly 113655 Bytes of data had been sent each time.
Thinking that I may have been sending too many messages I increased the While-loop delay from 10ms to 20, 100 and 200 ms but the error remained. I also tried playing with the TCP connection timeout and the TCP write timeout but neither of these had any effect on the problem.
I cannot see why this error is occuring, as the program works perfectly up untill the 113655 Bytes mark.
I have attached a screenshot of the basic VI (simply showing a MODBUS command being sent every second) and of a more advanced VI (where I am able to control each DO of the WAGO manually by setting a frequency at which the DO should switch between ON and OFF).
If anybody has any ideas on where the problems lie, or what I could do to further debug the program this would be greatly appreciated.
Solved!
Go to Solution.
Attachments:
Basic_VI.png 84 KB
Expanded_VI.png 89 KBAvdLinden wrote:
Hi ThiCop,
Yes the error occurs after exactly 113655 bytes every time. The timeout control I would like to use is 10ms, however even increasing this to 1s or 10s does not remove the error, which leads me to believe that this is not the issue (furthermore, not adding any delay to the while loop, thus letting it run at maximum speed, has shown that the TCP connection is able to send all 113655 bytes in under 3 seconds again pointing towards the timeout control not being the issue here).
I attempted Marco's suggestion but an having difficulty translating the string returned into a readable string, (rightnow the response given is " -# + ").
As to your second suggestion, I implemented something similar where I created a sub VI to build a TCP connection, send a message and then close the connection. I now build each message and then send the string to this subVI which successfully sends the command to my application. Whilst not being the most elegant method of solving the issue, it has resolved the timeout problem meaning I am able to send as many commands as I want. So in that sense the problem has been solved.
If you still have tips on how to correctly read the TCP read output, I would however like to see if I could not get my first program to work as it is slightly more robust in terms of timing.
Modbus TCP RTU is a binary protocol, as you show in your Basic VI, where you format the data stream using byte values. So you have to interprete the returned answer accordingly with the Modbus RTU spec in hand. Now what is most likely happening is that the connection gets hung after a while since you do NOT read the data the device sends as response to your commands. The TCP/IP stack buffers those bytes and at some point the internal buffers overflow and the connection is blocked by the stack. So adding the TCP Read at strategic places (usually after each write) is the proper solution for this. Is there any reason that you didn't use the NI provided Modbus TCP library?
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions -
Router closes TCP connection after 30 minutes
I have recently replaced my D-Link DIR-100 router with a Cisco Linksys RV042, but unfortunately there seems to be a problem with it.
I have an external TCP connection coming in to a local service, and I therefore set up the router to redirect the incoming connection for the given port to the local PC hosting the service. This worked perfectly. I also opened the Firewall access rules to allow all data from WAN2 to be propagated through. This also worked just fine, and I can connect from the internet to the local PC, just like I could with my old router. Unfortunately this is where the simularities stop. When there is no communication on the TCP connection for more than 30 minutes then the router closes the connection automatically. This is NOT what I want. I only communicate on the TCP connection very rarely, but I do not want it closed automatically - at least not after just 30 minutes.
I did some research on line and it appears that there in some routers are a TCP connection timeout, which in the router I read about, defaulted to 1 day. This would be OK. I experimented and found that if there is communication every 30 minutes then it is not close the connection, but if there is 50minutes between communication then it closes the connection.
As I read that this timeout has to do with security I experimented with the firewall and found the following:
1. Disabling the entire router firewall fixes the problem !!!
2. Disabling just DoS has no effect (problem still exists)
3. Disabling SPI means I cannot connect at all !!! (new and much worse problem)
4. Disabling Block WAN Requests has no effect (problem still exists)
Is there a way to solve this problem without disabling the entire firewall, as that is not what I want to do. I have the system set up for Dual WAN (load balancing), and I only want to allow connections to a handful of ports on the one WAN, and block the other WAN entirely.
P.S. I was referred to the Cisco Small Business Support Community by the Cisco Home community, so I hope this is the right place.Hi Ddb101,
This is a limitation (or feature depending on how you look at it) of the iPhone/iPod touch. 30 minutes after the device locks (usually 5 minutes of inactivity) the network turns off completely to save battery life. You can either turn autolock off globally, or some programs (mine for instance see: http://ootunes.com/app/ ) have an option that disables sleep while the app is running so the stream will keep playing... until your battery dies Only problem is with the screen on the battery actually dies even faster!
Finally, if the device is connected to a constant power source, it shouldn't actually time out. So if you have a way to plug it in, it shouldn't quit after 30 minutes on you...
hope that helps,
also, since there's a link to my site up there, and I sell the app, I should tell you that I might get money if you go to the page and end up buying my app... -
Proper method to reset tcp connection after timeout error
I have a application that I am building that communicates with a Modbus TCP device. If a communications error occurs I would like to be able the reset the TCP communications. What I have is a control that fires a event when pushed. In this event I have a sequence that first closes the tcp connection and then opens a new connection. My applications starts and runs fine. To test the reset function I removed the ethernet cable from the device and waited of a timeout to occur. I plugged the cable back in and pushed my reset control. Occasionally the reset will occur but most times I will get a time out error at the Open TCP vi. After this, the only way I can establish communications is to exit my application, disable and then enable my network device. Then when I restart my application I have communications with my device.
Any help would be appreciated on how I should be resetting my TCP connection.
Thanks
Terry
Solved!
Go to Solution.Terry S wrote:
I have attached a example vi (LV10) that shows just the TCP connection and Reset. An error will occur when trying to perform the open tcp in the reset event.
As written your code should be fine. There is nothing inherently wrong with it. However depending on the device you are communicating with you may be trying to reestablish the connection too quickly after you closed the connection. The device may not allow multiple connections to it and may require sometime to clean things up on its end after you close a connection. As an experiment trying waiting a short time between the TCP Close and the TCP Open. If possible you may want to try using Wireshark to see what is happening on the network. It can be useful in diagnosing what is going on.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot -
ASA TCP Idle Connection Timeout Suspense
Hello I upgraded our Cisco ASA 5520 with a Cisco ASA 5585. Though both ASA were configured with default TCP Idle Connection Timeout values people are now starting to complaint that idle SSH connections are being terminated. This is proper behavior but they were claiming it didn't occur with the old firewall. Our users are setting keepalives for 1800 seconds to get around this before I can bump the setting to infinite (setting 0). Is there a bug with the feature in older ASA OS?
Hi,
Before looking for a bug I would check the ASA logs (hopefully you are storing them to a separate Syslog server) and see why the connections are torn down (Teardown reason) and how long have they been on the ASAs connection table before they were torn down.
You also have the option to perform traffic capture on the ASA for the traffic in question and confirm why or which party terminates the connection.
I guess you can use the MPF on the ASA to configure separate idle timeouts for just these SSH Connections if you do not want to touch the global timeout values.
I have not run into any problems with the timeout settings on the older softwares. In the newer softwares (8.3+) I have run into these problems. In those situation the ASA has not removed the connection that have reached the timeout value. I have seen connection that have been idle for over 1000h.
- Jouni -
TCP connection inactivity timeout
Is it true that the ACE module has an tcp inactivity timeout of 3600 seconds (1 hour)?
Yes, it is true. These are the default values:
Parameter-map : new
Description : -
Type : connection
nagle : disabled
slow start : disabled
buffer-share size : 32768
inactivity timeout (seconds) : TCP: 3600, UDP: 120, ICMP: 2===================HERE IT IS
embryonic timeout (seconds) : 5
ack-delay (milliseconds) : 200
WAN Optimization RTT (milliseconds): 65535
half-closed timeout (seconds) : 3600
TOS rewrite : disabled
syn retry count : 4
TCP MSS min : 0
TCP MSS max : 1460
tcp-options drop range : 0-0
tcp-options allow range : 0-0
tcp-options clear range : 1-255
selective-ack : clear
timestamp : clear
window-scale : clear
window-scale factor : 0
reserved-bits : allow
random-seq-num : enabled
SYN data : allow
exceed-mss : drop
urgent-flag : allow
conn-rate-limit : disabled
bandwidth-rate-limit : disabled -
Outgoing TCP connections from VM have very low firewall state idle timeout -- how do you adjust?
When I create a TCP connection from a VM to the internet, if I'm idle for more than a few minutes (say a SSH session), the TCP flow is torn down by some AZURE networking element in between.
Incoming connections from the internet in don't seem to be affected.
I assume this is an Azure firewall timeout somewhere.
Is there any way to raise this?Hi,
Thanks for posting here.
Here are some suggestions:
[1] - You can make sure the TCP connection is not idle. To keep your TCP connection active you can keeping sending some data before 60 seconds passes. This could be done via chunked transfer encoding; send something or you can just send blank lines to keep
the connection active.
[2] - If you are using WCF based application please have a look at below link:
Reference:
http://code.msdn.microsoft.com/WCF-Azure-NetTCP-Keep-Alive-09f50fd9
[3] - If you are using TCP Sockets then you can also try ServicePointManager.SetTcpKeepAlive(true, 30000, 30000) might be used to do this. TCP Keep-Alive packets will keep the connection from your client to the load balancer open during a long-running HTTP
request. For example if you’re using .NET WebRequest objects in your client you would set ServicePointManager.SetTcpKeepAlive(…) appropriately.
Reference -
http://msdn.microsoft.com/en-us/library/system.net.servicepointmanager.settcpkeepalive.aspx
Hope this helps you.
Girish Prajwal -
Opening and closing Multiple TCP connections issues
Hi all I am having an issue with the TCP VI’s and wondering if anyone has experienced this issue.
My application is required to scan 50-100 IP addresses (statically assigned) and discover if an Ethernet device is connect at that IP address. Currently I am able to achieve this by opening a TCP connection and testing the error cluster to determine if a timeout has occurred (no timeout error means Ethernet device available at the IP address). I then ensure that the TCP connections are closed.
The issue I am have is that I require a 1 second delay between the TCP open and the TCP close which significantly slows down the process. Without the 1 second delay the vi successfully connects to the device once then fails to make any TCP connect regardless of the time delay until the PC is reset.
If anyone has any advice I would be very grateful
David Barr
P.S. I have attached a simplified section of code showing this issue
Attachments:
TCP Open close issue.vi 15 KBsmercurio_fc wrote:
If I understand you correctly you want the time delay to be 1 second if there's a successful connection....
While I don't have a specific answer for this problem. I want to clarify for him. I believe the issue is, what if all connections ARE there? That means you keep returning a wait of 1 second 50-100 times so It takes 50-100 seconds just to initialize. I think the user is looking for a way to check for valid connections, but do so in such a way that eliminates the need for a wait which is greatly slowing things down.
CLA, LabVIEW Versions 2010-2013 -
Connection timeout on hotel wifi - only with MacBook8.1 (810.9) configd plug-in:8.1 (810.9)
I'm having a "Connection Timeout" issue while trying to connect to my hotel's WIFI.
I bought an ex-lease refurbished white MacBook (Build 12E55 - 2.4GHz, the last 2010 model I think) a couple of weeks ago. I bought it so I could use it while on vacation in Bali, Indonesia. I've got OS X 10..8.4 installed.
At home in Australia, this MacBook connected to my home WIFI with absolutely no issues at all.
Now that I'm in Bali, I'm surprised to find that every time I try to connect to the WIFI at the hotel (where I'm staying for a whole month), I get a "Connection Timeout" error. I'm surprised because my iPhone connects to the hotel WIFI with no problem at all, as does our two iPads and the Android phones that belong to other family members. It's only my MacBook that struggles, even though I get even better signal strength indicated on my MacBook compared to my other devices.
I can connect my MacBook to my iPhone hotspot fine, though I'd prefer to use the free hotel WIFI over my very small 3G data allowance.
So the problem isn't that my MacBook can't connect to any WIFI, because it did at home and it still can to my iPhone hotspot.
And the problem isn't with the router, because all other devices work flawlessly.
I've trawled many forums and articles trying to find a solution. Here's everything I've tried already, that I can remember. (Not in this order and not all at once.)
Rebooted MacBook (duh)
Sitting directly under the WIFI router. (It's not a signal strength issue.)
Set up new Network > Location. Deleted Ethernet and Bluetooth PAN so it's just WIFI in the list.
Renewed DHCP Lease countless times.
Tried manual TCP/IP variations. It doesn't help that I'm not sure what to put in the IPv4 Address field. I do know the Subnet Mask and Router IP from looking at my iPhone network info.
Tried using my MAC address as the DHCP Client ID. Also tried just using "1" or leaving it blank.
I don't know what an IPv6 is either.
Tried BootP and completely Manual setups but not really sure of the correct settings to try.
Tried using the DNS servers that I found on my iPhone network info for the hotel WIFI. (One of them is 8.8.8.8 which I think is Google's DNS thing?)
Tried checking Auto Proxy Discovery and Use Passive FTP Mode, since it was suggested as part of a solution in a forum thread.
Tried changing the MTU to a couple of other settings from an article I read. I think one was around 1453 and the other was 1494 or something close to that.
Tried resetting PRAM
Tried resetting SMC
Tried a variation on resetting SMC that involved pressing down the normal keys plus one extra, for 10 secs, since it worked for someone who was told to do that by an Apple Care person. (He didn't know why it worked and other forum posters thought it was supposed to have been a SMC reset.)
Checked the Network> Wi-Fi in System Information to see if the Channel is compatible. The router uses Channel 1 and my MacBook is capable of using Channel 1.
Checked my country profile. It's X1. I have no idea if that's good. All I know is that I'm in Indonesia not Australia and I'm having WIFI issues with this hotel network.
Checked the PHY Mode. Supported are 802.11 a/b/g/n. The hotel router uses 802.11n.
Made sure I was using WPA2 Personal.
Tried deleting all WIFI-related passwords in Keychain.
Tried deleting all Network-related preference files.
Tried removing all LaunchDaemons and LaunchAgents.
It's not a "lost WIFI connection when waking from sleep" issue but I tried turning off sleep anyway.
My husband even had the nerve to unplug the hotel router (small hotel, we're the only guests at the moment) for 10 minutes hoping it will reboot. But I don't know if that's the actual modem or just a WIFI repeater thing (sorry, can't remember the right terms). It didn't work anyway.
I've run out of options, other than just sucking it up and getting a big 3G data allowance since I'm here for a month.
If there is anything else I can try - perhaps working out how to set up my Network manually properly, please help me out. Here is everything in System Information that might help. I'll happily provide any other info.
Software Versions:
CoreWLAN:Sorry. The topic title got mucked up when I tried to paste in my System Information. And I can't paste it in using my iPhone without it going haywire. I can provide any details you need.
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How to send joystick data over TCP connection
Hi all,
I am a long time Labview discussion forum user for learning, but this is my first time posting a question, I hope somebody can help me!
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
Again, the actual TCP communication I get, and can operate fine, just formatting all the data into a string (or whatever is required) so that I can unpack on the other side is the issue here.
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense...
One final question.....I already have a solution to this but using labview for the entirety of this project would be nice. I use skype to stream 1080p video from a webcam to my computer so I can view live feed. Can labview do this? This would be awesome if so, I am just not sure if the communication protocols in use could support real time (or as close as possible to streaming) for 1080p video.
Thanks all in advance for your help,
Physicsnole
Attachments:
cameraserver.vi 24 KB
cameraclient.vi 18 KBPhysicsnole wrote:
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Well, you cast the axis info cluster to a string, but then you cast it back to an array of DBL. Thatr's not compatible. You should probably cast it back to an "axis info" cluster of exactly the same type. Go the the other VI and right-click the cluster wire to create a constant. Now move that diagram cluster constant to the other VI and use it as type.
Your default ports don't seem to match. You seem to have client and server roles confused. In the sever you create a listener, but then you start sending packets, even though no connection is established. The connection needs to be initiated by the client.
Your client stops the loop the first time a timeout is encountered. Shouldn't that be more permanent? Also, please retain code clarity and avoid unecessary complexities. For example, replace the "not or" with a plain "or" and change the loop to "stop if true"
Physicsnole wrote:
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
You can send as much as you want. The casting to/from string is the same as described above.
Physicsnole wrote:
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense..
The primary function of a "server" is to wait for a connection and then communicate with the client once a conenction is established. An established TCP/IP connection is fully two-way and both sides can send and receive.
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