Strange error 500 with svn commit on one simple file

Question

We use VisualSVN server here at work and everything works fine, we have over 50 repositories. I tried today to put into a repository a web site but it keeps crashing at one specific single file that i've isolated.

Adding: C:\Work\LAN6505\web\trunk\common_files\includes\fr\debut.inc.php  
Sending content: C:\Work\LAN6505\web\trunk\common_files\includes\fr\debut.inc.php  
Error: Commit failed (details follow):  
Error: Server sent unexpected return value (500 Internal Server Error) in response to  
Error:  PUT request for  
Error:  '/svn/LAN6505/!svn/txr/13-i/web/trunk/common_files/includes/fr/debut.inc.php'  
Completed!:   

I simply get a 500 error, no more informations. Anyone know what to do with that? Is there a log file for VisualSvn server that i could look into.

If i copy the file to another repository with similar structure, the problem doesn't occur...

The code of the file can be found : http://pastebin.com/PwTCQSP7

Hope someone can help...

---

UPDATE

Event Type:       Error
Event Source:   VisualSVN Server 2.5
Event Category:               Apache 
Event ID:             1001
Date:                    1/23/2012
Time:                    9:37:10 AM
User:                    ACTIVIS-991RBEL\Mathieu Dumoulin
Computer:         DELL-PE2900-01
Description:
Could not get next bucket brigade  [500, #0]
[client 192.168.0.64]

---

UPDATE #2

Soooo, after spending 2.5 days migrating my SVN server on windows to a SVN server on linux, i got the same problem again:

[Fri Feb 24 16:35:21 2012] [error] [client 192.168.0.64] Could not get next bucket brigade (URI: /svn/LAN6505/!svn/wrk/289e3161-cdbf-d44d-9716-c6390289ec92/web/trunk/common_files/includes/fr/debut.inc.php) [500, #0]

[Fri Feb 24 16:36:12 2012] [error] [client 192.168.0.64] Could not get next bucket brigade (URI: /svn/LAN6505/!svn/wrk/554a4a6c-a015-7045-b0c6-072ffe01f854/web/trunk/common_files/includes/fr/debut.inc.php) [500, #0]

[Fri Feb 24 16:48:17 2012] [error] [client 192.168.0.64] Could not get next bucket brigade (URI: /svn/LAN6505/!svn/wrk/15bd0f7e-06b9-b046-8c67-5f9778fab9b5/web/trunk/common_files/includes/fr/debut.inc.php) [500, #0]

Answer 1

I have experienced the exactly same problem. It never happens with a local network connection. When I commit to a SVN repository on another side of the planet via VPN it happens often enough.

Turning off Kaspersky Internet Security 2012 helps, but not always.

Moreover, I often do my work and commit from a VirtualBox virtual machine. Sometimes even simple restart of the VM helps.

Another solution is to prevent IP fragmentation. You can check that your packets are fragmented by using the ping command: ping host_name -f

If there is a package fragmentation you can reduce your MTU size. This link provides a good description how to change the MTU size.

Unfortunately, all the above mentioned solutions are not 100% reliable. This error looks like a mystery for me also. I can't understand why SVN is so sensitive to these things.