TCP keepalives sent too early and terminates connection
I'm trying to implement an persistent TCP connection between an Android phone and a desktop server.
I've got heartbeat threads on both ends which are sending keepalive-packets on application level successfully.
The problem is that after a while (varies between 5-20min) the phone is starting to send TCP keepalives to the server, which the server does not seem to respond to. (I'm using Wireshark to monitor this).
This results in an exception on the server thread which is reading from the phone:java.net.SocketException: Connection reset
Why are the phone sending TCP keepalives so early? Even when there's constantly activity on application level? And why doesn't the desktop server respond to this keepalives?
I've checked my Android phone's settings with "sysctl -A | grep net.ipv4" and "net.ipv4.tcp_keepalive_time" is set to 7200 (2 hours).
Thanks.
shuwo wrote:
I'm holding both a wakelock and a wifilock, so that shouldn't be the problem. I also tried it without putting my phone to sleep at all. I want a persistent connection because I need live data to be transmitted over the network, is there any other method for that?
If it isn't keep alive packets, what could it be? What causes a connection reset on server side?I wouldn't rely on a persistent connection. Mobile phones and bad network conditions/lost connections is bound to happen, and can happen frequently.
What do you mean by live data? Are you e.g streaming data? Polling (e.g. once per minute) could otherwise be better, that is how gmail works.
I doubt that the battery will last more than 6-7 hours if the phone never goes down to sleep mode. You can easily test it. Create an app, that just aquires a wakelock and then run it on your phone without doing any else like accessing network etc. Constantly using the network will also reduce the battery time even more.
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Recording starting too early and also ending too e...
Another problem.....
When recording programmes I am frequently finding that the recording is starting way too early...5-10 minutes....and often ends too early (very annoying as one misses the end of a particular programme).
Any help, gratefully received!
ThanksRecording should start 2 minutes before the scheduled start time and end 5 minutes after the scheduled stop time (by default - you can increase this).
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Systemd: some services starting too early and then failing
Hello everyone,
I freshly installed Arch on this new laptop (Asus Zenbook Prime UX32VD) and from the start, I wanted to have a pure systemd setup. I'm using services only and I've uninstalled initscripts and so far it's working relatively well.
However, some services seem to start too early by default and the workarounds are unsatisfactory.
Problem 1: asus-screen-brightness and asus-kbd-backlight
On this lap top, the stock screen brightness buttons do not work (yet). A script and a service file (which are both available via the asus-screen-brightness AUR package) have to be used to allow users to change the brightness via the script. The problem is, with that service enabled, it only succeeds sometimes. About have of the time booting the laptop it fails, most likely because the necessary nodes in /sys/ do not exist yet. Restarting the service manually after booting does the trick:
[root@tachychineta shapeshifter]# sc status asus-screen-brightness
asus-screen-brightness.service - Allow user access to screen brightness
Loaded: loaded (/etc/systemd/system/asus-screen-brightness.service; enabled)
Active: active (exited) since Fri, 12 Oct 2012 11:23:44 +0200; 1min 1s ago
Process: 320 ExecStart=/usr/bin/asus-screen-brightness allowusers (code=exited, status=0/SUCCESS)
CGroup: name=systemd:/system/asus-screen-brightness.service
Oct 12 11:23:44 tachychineta systemd[1]: Starting Allow user access to screen brightness...
Oct 12 11:23:44 tachychineta sudo[349]: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness
Oct 12 11:23:44 tachychineta sudo[349]: pam_unix(sudo:session): session opened for user root by (uid=0)
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: cat: /sys/class/backlight/intel_backlight/max_brightness: No such file or directory
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: /usr/bin/asus-screen-brightness: line 8: /10: syntax error: operand expected (error token is "/10")
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: /usr/bin/asus-screen-brightness: line 10: 2*: syntax error: operand expected (error token is "*")
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: cat: /sys/class/backlight/intel_backlight/brightness: No such file or directory
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: chgrp: cannot access ‘/sys/class/backlight/intel_backlight/brightness’: No such file or directory
Oct 12 11:23:44 tachychineta asus-screen-brightness[320]: chmod: cannot access ‘/sys/class/backlight/intel_backlight/brightness’: No such file or directory
Oct 12 11:23:44 tachychineta systemd[1]: Started Allow user access to screen brightness.
[root@tachychineta shapeshifter]# sc restart asus-screen-brightness
[root@tachychineta shapeshifter]# sc status asus-screen-brightness
asus-screen-brightness.service - Allow user access to screen brightness
Loaded: loaded (/etc/systemd/system/asus-screen-brightness.service; enabled)
Active: active (exited) since Fri, 12 Oct 2012 11:25:28 +0200; 2s ago
Process: 2547 ExecStop=/usr/bin/asus-screen-brightness disallowusers (code=exited, status=0/SUCCESS)
Process: 2579 ExecStart=/usr/bin/asus-screen-brightness allowusers (code=exited, status=0/SUCCESS)
CGroup: name=systemd:/system/asus-screen-brightness.service
Oct 12 11:25:28 tachychineta systemd[1]: Starting Allow user access to screen brightness...
Oct 12 11:25:28 tachychineta sudo[2593]: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/chgrp users /sys/class/backlight/intel_backlight/brightness
Oct 12 11:25:28 tachychineta sudo[2593]: pam_unix(sudo:session): session opened for user root by (uid=0)
Oct 12 11:25:28 tachychineta sudo[2597]: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness
Oct 12 11:25:28 tachychineta sudo[2597]: pam_unix(sudo:session): session opened for user root by (uid=0)
Oct 12 11:25:28 tachychineta systemd[1]: Started Allow user access to screen brightness.
Exactly the same problem occurs with asus-kbd-backlight.service which is needed to allow users to control the keyboard backlight. It also fails because of missing /sys/ entries if started too early.
Problem 2: automatic login & X11
I use the method described on the wiki to autologin into TTY1 with my user and my .bash_profile contains
[[ $(fgconsole) = 1 ]] && startx
and my .xserverrc is configured as explained in this fantastically useful article by falconindy.
This way, X starts automatically and my session is properly authenticated for things like udiskie. I'm not using [testing] but instead rebuilt polkit with --enable-systemd and it's working just fine. The problem is, just like in problem 1, Xorg fails to start every now and then, failing with
(EE) No devices detected.
I don't have a full log because it hasn't happened in a while, but I'm very certain it's because the chipset isn't ready, yet.
Solutions?
I added "i915" to /etc/modules-load.d/static.conf hoping that would cover both the Xorg and backlight problems but it doesn't help. I then tried adding i915 to my MODULES in mkinitcpio.conf and rebuilding the initramfs and at least it looked like that way the problems went away but it added about 4 seconds to the time spent by the "kernel" during boot which is quite unacceptable. (Plots with and without i915 in MODULES).
I read the systemd.unit and systemd.service man pages but I can't find a way to speficy required kernel modules for a service file. I'm not sure if specifying the modules in /etc/modules-load.d shouldn't be enough (because apparently it's supposed to load for sysinit.target, which is early) but apparently it isn't.
Any ideas how I can get these services to work properly without sacrificing too much boot time?
Thank you
Last edited by Shapeshifter (2012-10-12 10:20:09)Please fill a bug report.
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I accidently unplugged my ipod too early and now it's frozen?
My ipod is now frozen and says "connected, eject before disconnecting", even though it's not plugged it. Nothing on it works now and whenever you plug it in, the computer only recognizes it as a USB.
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Please help ASAP.
Specs: IOS 10.6.8
Processor 2.4GHz Intel Core i5
Memory 4GB 1333 MHz DDR3 -- Everything is edited, sourced, and stored on an 2TB external hard drive to make things go faster.
Editing with FCP 7
When I export the sequence I edited with quicktime, the playback video is very different from what I edited on the timeline. The playback has the clips with ins and outs that are way off than what I cut, and some of the clips don't show at all or have changed transitions. However when I play in the timeline in FCP, the sequence is fine, just the way I cut it.
The source of the clips was one long .mov that I cut into clips for the timeline. Everything has gone smoothly but the exported .mov is just so different.
How can I get the time codes of the clips to be the same in the exported .movs? I just want the quicktime .mov to represent my edit exactly.
This video is due tomorrow - if the solution is too time consuming, can I play within the FCP player window and Log and Capture?
Thanks,
MVWhat is your source material? Is it H.264? FCP does not work correctly with that material.
Click on a source clip in the FCP Browser, and once selected, type Command + 9 to see the item properties for the clip. Either report those properties, or take a screen shot of the item properties, and post that here.
Next, click anywhere in your timeline, and then type Command + 0 {zero} to see your Sequence Settings. Either report those Sequence Settings, or take a screen shot of the Sequence Settings and post that here.
MtD -
so i forgot my ipods password an its disabled and now i remember my password an its too late and wont connect to itunes . any suggestions on what i can do ?
Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions
1. iOS- Forgotten passcode or device disabled after entering wrong passcode
2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen
3. Restoring iPod touch after forgotten passcode
4. What to Do If You've Forgotten Your iPhone's Passcode
5. iOS- Understanding passcodes
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Forgotten Restrictions Passcode Help
You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.
Also, see iTunes- Restoring iOS software. -
I plugged my 6th generation Ipod into my computer too early
I plugged my 6th generation Ipod into my computer too early and now Itunes keeps telling me to restore it. I have done this several times and no luck. My Ipod now doesnt even show up in 'My Computer' so I can't reformat either. Please someone help me!!!
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Windows TCP Socket Buffer Hitting Plateau Too Early
Note: This is a repost of a ServerFault Question edited over the course of a few days, originally here: http://serverfault.com/questions/608060/windows-tcp-window-scaling-hitting-plateau-too-early
Scenario: We have a number of Windows clients regularly uploading large files (FTP/SVN/HTTP PUT/SCP) to Linux servers that are ~100-160ms away. We have 1Gbit/s synchronous bandwidth at the office and the servers are either AWS instances or physically hosted
in US DCs.
The initial report was that uploads to a new server instance were much slower than they could be. This bore out in testing and from multiple locations; clients were seeing stable 2-5Mbit/s to the host from their Windows systems.
I broke out iperf
-s on a an AWS instance and then from a Windows client in the office:
iperf
-c 1.2.3.4
[ 5] local 10.169.40.14 port 5001 connected with 1.2.3.4 port 55185
[ 5] 0.0-10.0 sec 6.55 MBytes 5.48 Mbits/sec
iperf
-w1M -c 1.2.3.4
[ 4] local 10.169.40.14 port 5001 connected with 1.2.3.4 port 55239
[ 4] 0.0-18.3 sec 196 MBytes 89.6 Mbits/sec
The latter figure can vary significantly on subsequent tests, (Vagaries of AWS) but is usually between 70 and 130Mbit/s which is more than enough for our needs. Wiresharking the session, I can see:
iperf
-c Windows SYN - Window 64kb, Scale 1 - Linux SYN, ACK: Window 14kb, Scale: 9 (*512)
iperf
-c -w1M Windows SYN - Windows 64kb, Scale 1 - Linux SYN, ACK: Window 14kb, Scale: 9
Clearly the link can sustain this high throughput, but I have to explicity set the window size to make any use of it, which most real world applications won't let me do. The TCP handshakes use the same starting points in each case, but the forced one scales
Conversely, from a Linux client on the same network a straight, iperf
-c (using the system default 85kb) gives me:
[ 5] local 10.169.40.14 port 5001 connected with 1.2.3.4 port 33263
[ 5] 0.0-10.8 sec 142 MBytes 110 Mbits/sec
Without any forcing, it scales as expected. This can't be something in the intervening hops or our local switches/routers and seems to affect Windows 7 and 8 clients alike. I've read lots of guides on auto-tuning, but these are typically about disabling scaling
altogether to work around bad terrible home networking kit.
Can anyone tell me what's happening here and give me a way of fixing it? (Preferably something I can stick in to the registry via GPO.)
Notes
The AWS Linux instance in question has the following kernel settings applied in sysctl.conf:
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.rmem_default = 1048576
net.core.wmem_default = 1048576
net.ipv4.tcp_rmem = 4096 1048576 16777216
net.ipv4.tcp_wmem = 4096 1048576 16777216
I've used dd
if=/dev/zero | nc redirecting to /dev/null at
the server end to rule out iperfand
remove any other possible bottlenecks, but the results are much the same. Tests with ncftp(Cygwin,
Native Windows, Linux) scale in much the same way as the above iperf tests on their respective platforms.
First fix attempts.
Enabling CTCP - This makes no difference; window scaling is identical. (If I understand this correctly, this setting increases the rate at which the congestion window is enlarged rather than the maximum size it can reach)
Enabling TCP timestamps. - No change here either.
Nagle's algorithm - That makes sense and at least it means I can probably ignore that particular blips in the graph as any indication of the problem.
pcap files: Zip file available here: https://www.dropbox.com/s/104qdysmk01lnf6/iperf-pcaps-10s-Win%2BLinux-2014-06-30.zip (Anonymised
with bittwiste, extracts to ~150MB as there's one from each OS client for comparison)
Second fix attempts.
I've enabled ctcp and disabled chimney offloading: TCP Global Parameters
Receive-Side Scaling State : enabled
Chimney Offload State : disabled
NetDMA State : enabled
Direct Cache Acess (DCA) : disabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : ctcp
ECN Capability : disabled
RFC 1323 Timestamps : enabled
Initial RTO : 3000
Non Sack Rtt Resiliency : disabled
But sadly, no change in the throughput.
I do have a cause/effect question here, though: The graphs are of the RWIN value set in the server's ACKs to the client. With Windows clients, am I right in thinking that Linux isn't scaling this value beyond that low point because the client's limited CWIN
prevents even that buffer from being filled? Could there be some other reason that Linux is artificially limiting the RWIN?
Note: I've tried turning on ECN for the hell of it; but no change, there.
Third fix attempts.
No change following disabling heuristics and RWIN autotuning. Have updated the Intel network drivers to the latest (12.10.28.0) with software that exposes functioanlity tweaks viadevice manager tabs. The card is an 82579V Chipset on-board NIC - (I'm going to
do some more testing from clients with realtek or other vendors)
Focusing on the NIC for a moment, I've tried the following (Mostly just ruling out unlikely culprits):
Increase receive buffers to 2k from 256 and transmit buffers to 2k from 512 (Both now at maximum) - No change
Disabled all IP/TCP/UDP checksum offloading. - No change.
Disabled Large Send Offload - Nada.
Turned off IPv6, QoS scheduling - Nowt.
Further investigation
Trying to eliminate the Linux server side, I started up a Server 2012R2 instance and repeated the tests using iperf (cygwin
binary) and NTttcp.
With iperf,
I had to explicitly specify -w1m on both sides
before the connection would scale beyond ~5Mbit/s. (Incidentally, I could be checked and the BDP of ~5Mbits at 91ms latency is almost precisely 64kb. Spot the limit...)
The ntttcp binaries showed now such limitation. Using ntttcpr
-m 1,0,1.2.3.5 on the server and ntttcp
-s -m 1,0,1.2.3.5 -t 10 on the client, I can see much better throughput:
Copyright Version 5.28
Network activity progressing...
Thread Time(s) Throughput(KB/s) Avg B / Compl
====== ======= ================ =============
0 9.990 8155.355 65536.000
##### Totals: #####
Bytes(MEG) realtime(s) Avg Frame Size Throughput(MB/s)
================ =========== ============== ================
79.562500 10.001 1442.556 7.955
Throughput(Buffers/s) Cycles/Byte Buffers
===================== =========== =============
127.287 308.256 1273.000
DPCs(count/s) Pkts(num/DPC) Intr(count/s) Pkts(num/intr)
============= ============= =============== ==============
1868.713 0.785 9336.366 0.157
Packets Sent Packets Received Retransmits Errors Avg. CPU %
============ ================ =========== ====== ==========
57833 14664 0 0 9.476
8MB/s puts it up at the levels I was getting with explicitly large windows in iperf.
Oddly, though, 80MB in 1273 buffers = a 64kB buffer again. A further wireshark shows a good, variable RWIN coming back from the server (Scale factor 256) that the client seems to fulfil; so perhaps ntttcp is misreporting the send window.
Further PCAP files have been provided, here:https://www.dropbox.com/s/dtlvy1vi46x75it/iperf%2Bntttcp%2Bftp-pcaps-2014-07-03.zip
Two more iperfs,
both from Windows to the same Linux server as before (1.2.3.4): One with a 128k Socket size and default 64k window (restricts to ~5Mbit/s again) and one with a 1MB send window and default 8kb socket size. (scales higher)
One ntttcp trace
from the same Windows client to a Server 2012R2 EC2 instance (1.2.3.5). here, the throughput scales well. Note: NTttcp does something odd on port 6001 before it opens the test connection. Not sure what's happening there.
One FTP data trace, uploading 20MB of /dev/urandom to
a near identical linux host (1.2.3.6) using Cygwin ncftp.
Again the limit is there. The pattern is much the same using Windows Filezilla.
Changing the iperf buffer
length does make the expected difference to the time sequence graph (much more vertical sections), but the actual throughput is unchanged.
So we have a final question through all of this: Where is this limitation creeping in? If we simply have user-space software not written to take advantage of Long Fat Networks, can anything be done in the OS to improve the situation?Hi,
Thanks for posting in Microsoft TechNet forums.
I will try to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.
Kate Li
TechNet Community Support -
Outlook displays date of birthdays one day too early in MS Office 2007, 2010 and 2013
Hi
We are supporting several clients that has issues with Outlook. Different versions of Windows, Office and different exchange server versions. Some contacts' birthdays
just "magically" changes to one day too early. I have done extensive research with no answer. I have experienced this issue personally as early as about 2005 or 2006 with a Windows Mobile PDA.
Our local time is GMT +2 without daylight-savings. I have checked the settings in Windows (Vista Pro and Win 7 pro
x86 and x64) and the calendar settings, I have reloaded a couple of pc's, created new profiles, installed new server hardware with newer exchange. Even tried a few off-the-wall ideas like resetting all views to default.
Some users' address books are shared, some not. Some uses Apple, Android, BB or Windows phone, some don't. Some connects through VPN, some don't. Some uses
AVG, Avast, Eset Nod, Forticlient, Mcafee, etc....
I have been fighting this problem for months, and can find no conclusive answer that resolves this.
If I manually open the contact and rectify the date, it will stay correct for a very random time period and then shift
again.
I am about to lose a couple of my biggest clients, and probably my job as well, so I need urgent help.
Please no remarks on OS version, Office version or mobile devices, as this is definitely not the issue.
HELP!Hi,
Have the users check on OWA, does the issue persist? Please also make sure the timezone of Exchange is also properly configured.
I'm not an expert about Exchange, I hope this blog can be helpful:
http://blogs.technet.com/b/fun_with_powershell/archive/2013/04/30/where-is-the-time-zone-property-stored-in-exchange-2010.aspx
To further dig the problem, rectify the date on owa and drop Outlook for a while(or one day), check the result the next day if the problem will come back.
Regards,
Melon Chen
TechNet Community Support -
I just brought a brand new Macbook pro retina display, when i connect it to my apple tv through airplay its too slow and when it try to play a movie apply tv is always a minute or 2 behind. How can i fix this?
Hello HanaAmer1,
We've an article which provides troubleshooting steps that can help get AirPlay workign correctly.
iTunes: Troubleshooting AirPlay and AirPlay Mirroring
http://support.apple.com/kb/TS5209
Cheers,
Allen -
Taking too much time and not connecting to ipad software server
taking too much time and not connecting to ipad software server and not updating.. why
because everyone is doing the same thing you are... be patient, and you will get the update... I had to grab the update over 3G (it won't let you download or install, but it got me in the door) and then switch back to wifi and download and install.
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I have a MacBook Pro. My mac can detect wifi. But will not connect anywhere. I did get connected via TCP/IP settings but I can't connect to any wifi anywhere. Network diagnostic has a green light for wi-fi and wi-fi settings. Red light for the rest. (Network settings, ISP, Internet and server.)
Hello NotAppleSavy,
Thanks for the question. After reviewing your post, it sounds like the computer wont connect to networks. I see you have used network diagnostic. I would recommend that you read this article, there are a lot of other things you can do in this article that may be able to help you resolve or isolate the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
Thanks for using Apple Support Communities.
Have a nice day,
Mario -
well i was listening to music on my iphone and then it just stopped and now it won't come back on. i tried resetting it alot and nothing i mean nothing comes on! i tried recharging too and nothing and tried connecting it to itunes and nothing! Help? what can i do?
http://support.apple.com/kb/TS3281
-
So I opened my whole iPhone 4 up and I was trying to replace the home button as it got worn out so when I tried taking the ribbon off, I pulled a bit too hard and then the whole thing just broke so now I cant even connect the ribbon anymore. So is there a way that I could replace it or not?
No one here works for or represents Apple, thus no one here can definitively answer your question. Out of warranty replacements require the phone, you're replacing, be in one piece. Generally, when you perform surgery yourself, you void the ability to take advantage of an out of warranty replacement.
Put everything back together, make an appointment at an Apple store & hope for the best.
Good luck. -
Hello there
I have a problem with my windows media player while using server and client connection by using TCP/IP connection. So when I play a video using Windows Media Player in LabVIew there isn't any sound come out but when I'm playing a video by a Windows Media Player only the sound will come out. Can you help me solve this problem?
I also upload the vi as the reference.
The username for the client is ihsanhaikalz and the password is ganteng
Thanks
Attachments:
Client Remote.vi 746 KB
Server Remote.vi 1433 KBHi ican,
I was looking at your VI's but I cannot seem to pinpoint exactly where you are using Windows Media Player. In order to more quickly assist you, could you please recreate this issue more concisely in a smaller set of VIs. Also, were you able to get sound when you did not use the TCP/IP connection and simply played the files in LabVIEW?
I noticed in a few places that you were using the Play Sound File.VI from the Graphics and Sounds palette. Is that what you are refering to? I noticed there that the file path that you have designated for the song is simply the song title. Instead, this should be a path to where the song is located on your computer.
Also, if you are planning on using Windows Media Player, have you considered using the ActiveX commands for Windows Media Player? Here are a few examples if you are unfamiliar with this functionality.
Example 1 and Example 2.
I hope this helps!
Kim W.
Applications Engineer
National Instruments
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