502 Errors downloading SETI artifacts
Questions and Answers :
Web site :
502 Errors downloading SETI artifacts
Message board moderation
| Author | Message |
|---|---|
 ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38 
 |
I access the Internet by plugging in a cell phone to my desktop PC. Periodically, my cellco "slows down" my packets to about 10KBytes/sec (when I go over my limited bandwidth) Even though I can't doanload as quickly, I still expected to be able to use this PC for SETI@home work, since I plug my phone into it from 7PM to 7AM. I have set up my preference to limit download and upload rates to what I've observed, but workunit downloads keep aborting, as if there was an internal "kill slow downloads" system in place that doesn't check the "limit download speed setting". So I end up with a bunch of aborted tasks, apparently, and SETI@home essentially blacklists me for having a slow connection. Please tell me what I need to do to correct the situation. Thanks! Here's a sample of the messages I see. Tue 24 Jan 2012 09:46:29 AM EST SETI@home Backing off 1 min 0 sec on download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 09:50:52 AM EST SETI@home Started download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 09:50:52 AM EST SETI@home Started download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 09:50:53 AM EST SETI@home Temporarily failed download of setiathome_6.03_i686-pc-linux-gnu: can't resolve hostname Tue 24 Jan 2012 09:50:53 AM EST SETI@home Backing off 1 min 0 sec on download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 09:50:53 AM EST SETI@home Temporarily failed download of 15oc11ab.19489.2935.12.10.52: can't resolve hostname Tue 24 Jan 2012 09:50:53 AM EST SETI@home Backing off 1 min 0 sec on download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 10:40:08 AM EST SETI@home Started download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 10:40:08 AM EST SETI@home Started download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 10:40:09 AM EST SETI@home Temporarily failed download of setiathome_6.03_i686-pc-linux-gnu: can't resolve hostname Tue 24 Jan 2012 10:40:09 AM EST SETI@home Backing off 1 min 0 sec on download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 10:40:09 AM EST SETI@home Temporarily failed download of 15oc11ab.19489.2935.12.10.52: can't resolve hostname Tue 24 Jan 2012 10:40:09 AM EST SETI@home Backing off 1 min 0 sec on download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 12:02:31 PM EST SETI@home Started download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 12:02:31 PM EST SETI@home Started download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 12:02:32 PM EST SETI@home Temporarily failed download of setiathome_6.03_i686-pc-linux-gnu: can't resolve hostname Tue 24 Jan 2012 12:02:32 PM EST SETI@home Backing off 1 min 0 sec on download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 12:02:32 PM EST SETI@home Temporarily failed download of 15oc11ab.19489.2935.12.10.52: can't resolve hostname Tue 24 Jan 2012 12:02:32 PM EST SETI@home Backing off 1 min 0 sec on download of 15oc11ab.19489.2935.12.10.52 Tue 24 Jan 2012 03:02:12 PM EST SETI@home Started download of setiathome_6.03_i686-pc-linux-gnu Tue 24 Jan 2012 03:02:12 PM EST SETI@home Started download of 15oc11ab.19489.2935.12.10.52 Here's the application details I see as of 7PM today: SETI@home Enhanced 5.28 x86_64-pc-linux-gnu Number of tasks completed 3243 Max tasks per day 1 Number of tasks today 0 Consecutive valid tasks 0 Average processing rate 11.994520458182 Average turnaround time 34.57 days SETI@home Enhanced 6.03 i686-pc-linux-gnu Number of tasks completed 490 Max tasks per day 1 Number of tasks today 0 Consecutive valid tasks 0 Average processing rate 7.8352645230377 Average turnaround time 37.20 days 
ID: 1188144 ·  |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
Also, I should point out that I'd normally post this to one of the "number crunchers" boards, but since I have 0.05 recent average credit, I can't even post to the normal SETI message boards (I have 900,000 workunits of credit, just not enough of is recent enough to allow me to post - kinda ridiculous)
ID: 1188145 · |
John McLeod VII  Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
This is a good place to post the problem. The more recent versions of the BOINC client have a setting to limit the amount of data transferred / time period. You get to specify the time period and the amount of data. If you set these correctly, you should be able to prevent yourself from going over the limit.   BOINC WIKI ID: 1188153 · |
Gatekeeper  Send message Joined: 14 Jul 04 Posts: 887 Credit: 176,479,616 RAC: 0
|
I access the Internet by plugging in a cell phone to my desktop PC. Periodically, my cellco "slows down" my packets to about 10KBytes/sec (when I go over my limited bandwidth) I'm not a linux user, and haven't ever tried data transfer of this magnitude with a cellphone connection, but the error message "can't resolve hostname" generally occurs when your internet connection is lost. IIRC, the connection can't resolve with a DNS server, hence the error. I also see it occasionally if my router chokes up, and a reset of the router corrects it. So, I'd speculate based on the above log that, at the time, your cell wasn't connecting to the internet. And the downloads aren't "aborting", they're just being delayed and retried. OTOH, if you're manually aborting them, Seti will take note of that and severely restrict the amount of work it will try to send to you. A "dialup" connection might be slower than many here use, but there is no "penalty" per se for slower download speeds.  
ID: 1188186 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
Downloads appear to be running to completion now, but I'm still experiencing sporadic "download error" messages with actual work units, and they never show up in the "tasks" page. I was able to download the smaller files that apparently come with a new setiathome executable. Wed 25 Jan 2012 03:21:05 AM EST SETI@home Temporarily failed download of setiathome_6.03_i686-pc-linux-gnu: HTTP error Even when no download errors are reported, the tasks never show up in the tasks list of the client. Downloads for both Astropulse and "classic" S@H seem to be hampered. Wed 25 Jan 2012 03:38:30 AM EST SETI@home Started download of 23oc11af.5719.19672.4.10.159
ID: 1188236 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
On a hunch, I also check "disable image file verification", on a chance that my ISP (T-mobile) is modifying image files. I hope this isn't the case, since I expect my ISP to transmit the data as it is, no matter whether it thinks it can optimize the data...
ID: 1188237 · |
|
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
On a hunch, I also check "disable image file verification", on a chance that my ISP (T-mobile) is modifying image files. I hope this isn't the case, since I expect my ISP to transmit the data as it is, no matter whether it thinks it can optimize the data... If there is a "turbo speed" or similar setting available at your ISP, it enables the recompression of jpg files. BOINC WIKI ID: 1188265 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
Very strange. I'm seeing checksum errors, multiple times, for downloads. There is no "turbo mode" switch on my phone.but if they are trying to recompressing "image files", then I'm suspicious about that. What data type/mime type are the workunits sent as? Wed 25 Jan 2012 04:15:01 AM EST SETI@home [error] File ap_11oc11ah_B6_P1_00355_20120124_02614.wu has wrong size: expected 8392051, got 495616 Wed 25 Jan 2012 04:15:01 AM EST SETI@home [error] Checksum or signature error for ap_11oc11ah_B6_P1_00355_20120124_02614.wu Wed 25 Jan 2012 04:17:05 AM EST SETI@home Finished download of ap_11oc11ah_B3_P0_00197_20120124_21598.wu Wed 25 Jan 2012 04:17:05 AM EST SETI@home [error] File ap_11oc11ah_B3_P0_00197_20120124_21598.wu has wrong size: expected 8392049, got 577536 Wed 25 Jan 2012 04:17:05 AM EST SETI@home [error] Checksum or signature error for ap_11oc11ah_B3_P0_00197_20120124_21598.wu Wed 25 Jan 2012 04:18:27 AM EST SETI@home Sending scheduler request: To fetch work. Wed 25 Jan 2012 04:18:27 AM EST SETI@home Reporting 3 completed tasks, requesting new tasks for GPU Wed 25 Jan 2012 04:18:43 AM EST SETI@home Scheduler request completed: got 0 new tasks Wed 25 Jan 2012 04:18:43 AM EST SETI@home Message from server: Project has no tasks available Wed 25 Jan 2012 04:19:50 AM EST SETI@home Finished download of ap_11oc11ah_B2_P1_00222_20120124_17754.wu Wed 25 Jan 2012 04:19:50 AM EST SETI@home [error] File ap_11oc11ah_B2_P1_00222_20120124_17754.wu has wrong size: expected 8392048, got 733184 Wed 25 Jan 2012 04:19:50 AM EST SETI@home [error] Checksum or signature error for ap_11oc11ah_B2_P1_00222_20120124_17754.wu Wed 25 Jan 2012 04:23:48 AM EST SETI@home Sending scheduler request: To fetch work. Wed 25 Jan 2012 04:23:48 AM EST SETI@home Reporting 1 completed tasks, requesting new tasks for GPU
ID: 1188273 · |
|
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
Very strange. I'm seeing checksum errors, multiple times, for downloads. It would not be on the phone, it would be at the ISP (and if you are logging in through a phone, you may not be able to turn it off). BOINC WIKI ID: 1188439 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
Are SETI@home workunits actually transmitted as .JPEG files? I'm really confused, I would think they would be sent as another MIME type, something more like "binary data", since they would have a different kind of file format? I've seen notes on various cell phone discussion about disabling caching and proxy server settings to enable that, but nothing is being discussed on the message boards about which ISP/carriers are trying to compress workunits and causing failures. I can run the boinc command line, but need a better idea about what commands to run to test things one command at a time....
ID: 1188476 · |
|
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0 
|
Are SETI@home workunits actually transmitted as .JPEG files? No, not the work units but some images after initially adding the project or after a reset. I can't tell you why your work units aren't downloaded correctly, but perhaps you should disable receiving of AstroPulse WUs on your SETI@home preferences page, because they have 8 MiB in contrast to the 300 KiB of the MultiBeam units. As for debugging, you could try some logging options in cc_config.xml (namely those containing 'http' and 'xfer' in the name. Gruß, Gundolf ID: 1188478 · |
BilBg  Send message Joined: 27 May 07 Posts: 3720 Credit: 9,385,827 RAC: 0 
|
You can try Hotspot Shield http://setiathome.berkeley.edu/forum_thread.php?id=64691&nowrap=true#1140754 It creates VPN connection - while Hotspot Shield is running any program on your computer will automatically use this VPN connection to get/send anything from/to Internet. Since this VPN connection is encoded ('Secure tunnel' just like HTTPS) I think your ISP will not know what is transmitted and will be unable to change anything. Â   - ALF - "Find out what you don't do well ..... then don't do it!" :)Â ID: 1188496 · |
|
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
Are SETI@home workunits actually transmitted as .JPEG files? There are several pieces, some of which are required to be exact for computation to happen correctly, but the images for the screen saver are not in that list. The png files are just for pretty pictures on the screen saver. BOINC WIKI ID: 1188674 · |
Jord  Send message Joined: 9 Jun 99 Posts: 15184 Credit: 4,362,181 RAC: 3 
|
The png files are just for pretty pictures on the screen saver. Actually, the .png files are for the Simple View project icon and project slide show. As far as I know, the image on the Seti screen saver is a .jpeg. ;-) ID: 1188697 · |
|
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
The png files are just for pretty pictures on the screen saver. Ah. Ok. Still just pretty pictures... BOINC WIKI ID: 1188711 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
The BOINC client tried downloading some .vlar (smaller SETI@home) workunits. I seem to be getting consistent HTTP Errors, but it seems unlikely that I'd be getting this many actually network errors, unless something is seriously wrong.. Web browsing works without a hitch, so I'm not sure what the problem could be. Is there a manually downloadable workunit I can try running, even if I don't get credit for it? I want to isolate where the error is actually occurring. Suggestions welcome, Thanks! Thu 26 Jan 2012 09:12:56 PM EST SETI@home Finished download of 29oc11ac.27507.2112.16.10.32.vlar Thu 26 Jan 2012 09:12:56 PM EST SETI@home Finished download of 29oc11ac.27507.2112.16.10.34.vlar Thu 26 Jan 2012 09:12:56 PM EST SETI@home Started download of 03oc11ah.27053.5793.4.10.18 Thu 26 Jan 2012 09:12:56 PM EST SETI@home Started download of 03oc11ah.27053.5793.4.10.12 Thu 26 Jan 2012 09:12:56 PM EST SETI@home [error] File 29oc11ac.27507.2112.16.10.32.vlar has wrong size: expected 375192, got 399366 Thu 26 Jan 2012 09:12:56 PM EST SETI@home [error] Checksum or signature error for 29oc11ac.27507.2112.16.10.32.vlar Thu 26 Jan 2012 09:12:56 PM EST SETI@home [error] File 29oc11ac.27507.2112.16.10.34.vlar has wrong size: expected 375195, got 395175 Thu 26 Jan 2012 09:12:56 PM EST SETI@home [error] Checksum or signature error for 29oc11ac.27507.2112.16.10.34.vlar When I PING one of the BOINC servers, I get a 33% packet loss rate. PING 208.68.240.13 (208.68.240.13) 56(84) bytes of data. 64 bytes from 208.68.240.13: icmp_seq=1 ttl=51 time=1878 ms ... 64 bytes from 208.68.240.13: icmp_seq=28 ttl=51 time=1613 ms --- 208.68.240.13 ping statistics --- 30 packets transmitted, 20 received, 33% packet loss, time 29030ms rtt min/avg/max/mdev = 1613.814/1881.041/2081.830/132.326 ms, pipe 3 ID: 1188721 · |
|
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0
|
ID: 1188765 · |
|
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0
|
There are several pieces, some of which are required to be exact for computation to happen correctly, but the images for the screen saver are not in that list. The png files are just for pretty pictures on the screen saver. But will BOINC start any tasks if the .png (or .jpg) files aren't downloaded completely? Gruß, Gundolf ID: 1188818 · |
|
ralphw Send message Joined: 7 May 99 Posts: 78 Credit: 18,032,718 RAC: 38
|
The BOINC client I run on Ubuntu Linux is trying to download several things:
seti@home workunits a new seti@home application
ID: 1188830 · |
|
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0
|
I've enabled additional debug logging by changing a few zeros to ones, but don't see any extra output. Is there a log file/directory I should be looking for on Linux, that shows the BOINC manager and BOINC Apps starting up? The cc_config.xml file with the options must be an ANSI file placed in your BOINC data directory. You'll see the line about log flags updated in the BOINC startup messages. The file that contains those same messages is also in the BOINC data directory and its name starts with stdoutdae. I'm not sure about the suffix with linux. Gruß, Gundolf ID: 1189024 · |
©2024 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.