Upload keeps jamming at 16 KB

kitchen
kitchen
Joined: 13 Aug 10
Posts: 4
Credit: 73,293,538
RAC: 17,710
Topic 195454

My uploads keep jamming at 16 KB. Putting Wireshark onto the link appears to reveal an issue with TCP communications (though ping works perfectly), and the connection is terminated with the following message (decoded into plaintext):
--------------------------(Start)
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
Apache/2.2.3 (CentOS) Server at einstein.phys.uwm.edu Port 80
--------------------------(End)

It is preceeded by the following message:
--------------------------(Start)
HTTP/1.1 500 Internal Server Error
Date: Mon, 15 Nov 2010 04:43:21 GMT
Server: Apache/2.2.3 (CentOS)
Content-Length: 620
Connection: close
Content-Type: text/html; charset=iso-8859-1
--------------------------(End)

The presumed TCP issue comes from the number of "[TCP Retransmission] [TCP segment of a reassembled PDU]" packets, which re-tries a TCP segment at 2, 6, 11, 22 and 43 second intervals.

Configuration:
Ubuntu 9.10, fully patched.

This issue appeared two to three weeks ago, BOINC having worked perfectly for many weeks beforehand.

mikey
mikey
Joined: 22 Jan 05
Posts: 5,118
Credit: 518,686,098
RAC: 89,289

Upload keeps jamming at 16 KB

Quote:

My uploads keep jamming at 16 KB. Putting Wireshark onto the link appears to reveal an issue with TCP communications (though ping works perfectly), and the connection is terminated with the following message (decoded into plaintext):
--------------------------(Start)
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
Apache/2.2.3 (CentOS) Server at einstein.phys.uwm.edu Port 80
--------------------------(End)

It is preceeded by the following message:
--------------------------(Start)
HTTP/1.1 500 Internal Server Error
Date: Mon, 15 Nov 2010 04:43:21 GMT
Server: Apache/2.2.3 (CentOS)
Content-Length: 620
Connection: close
Content-Type: text/html; charset=iso-8859-1
--------------------------(End)

The presumed TCP issue comes from the number of "[TCP Retransmission] [TCP segment of a reassembled PDU]" packets, which re-tries a TCP segment at 2, 6, 11, 22 and 43 second intervals.

Configuration:
Ubuntu 9.10, fully patched.

This issue appeared two to three weeks ago, BOINC having worked perfectly for many weeks beforehand.

Try restarting the pc, often the Server end, Einstein in this case, makes a change and although it should be picked up by all other pc's it does not always happen that way. Rebooting will usually make this happen. You COULD try just shutting down Boinc and then, after a slow count to 10, restarting it.

kitchen
kitchen
Joined: 13 Aug 10
Posts: 4
Credit: 73,293,538
RAC: 17,710

Thanks for the suggestion. As

Thanks for the suggestion. As you might have guessed, I have already tried that, without success. (I needed to re-boot the machine to ensure that I had a clean Wireshark capture.)

mikey
mikey
Joined: 22 Jan 05
Posts: 5,118
Credit: 518,686,098
RAC: 89,289

RE: Thanks for the

Quote:
Thanks for the suggestion. As you might have guessed, I have already tried that, without success. (I needed to re-boot the machine to ensure that I had a clean Wireshark capture.)

DARN!!!

Michael Karlinsky
Michael Karlinsky
Joined: 22 Jan 05
Posts: 888
Credit: 22,245,334
RAC: 0

Hi, reboot, the classic

Hi,

reboot, the classic advice.

What about your dsl/wireless/whatever router?

Michael

Gundolf Jahn
Gundolf Jahn
Joined: 1 Mar 05
Posts: 1,079
Credit: 341,280
RAC: 0

RE: HTTP/1.1 500 Internal

Quote:
HTTP/1.1 500 Internal Server Error


Okay, the following is actually against "HTTP Error 417 Expectation failed", but you could try it nevertheless (it switches from HTTP 1.1 to 1.0).

Create a cc_config.xml file (plain ASCII) in your BOINC data directory and copy&paste[pre]

1
1


1

[/pre]into it. Then restart BOINC; perhaps it helps. :-)

Gruß,
Gundolf

Computer sind nicht alles im Leben. (Kleiner Scherz)

kitchen
kitchen
Joined: 13 Aug 10
Posts: 4
Credit: 73,293,538
RAC: 17,710

Another machine on the same

Another machine on the same router work (almost) flawlessly: I saw *one* incident of "unable to communicate". My guess is that it might be my client. I will try Gundolf's suggestion first, though.

kitchen
kitchen
Joined: 13 Aug 10
Posts: 4
Credit: 73,293,538
RAC: 17,710

It's been a long story: I

It's been a long story: I couldn't try Gundolf's suggestion, because I could not easily get rid of an earlier client (6.4.5, via Synaptic) that I had subsequently installed.

In the end, I formatted the system drive, loaded a more recent version of Ubuntu (10.04 LTS), and installed the current client (6.10.58), and everything now seems to be working fine.

Thanks to all of you for your help and moral support.

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