SWFupload 500错误

discuz 论坛将www域名换成bbs后编辑器内swfuplaod上传报500错误，但是有时候能正常上传;
目前基本排除服务器上PHP的问题，因为改成空白页面也一样报错。
有人遇到过这个问题吗？求指点


swfupload 日志：

---SWFUpload Instance Info---
Version: 2.5.0 2010-01-15 Beta 2
Movie Name: SWFUpload_0
Settings:
upload_url: http://bbs.xxxx.com/misc.php?mod=swfupload&action=swfupload&operation=upload&fid=72
flash_url: static/image/common/swfupload.swf?preventswfcaching=1398395968643
flash9_url: static/image/common/swfupload.swf?preventswfcaching=1398395968643
use_query_string: false
requeue_on_error: false
http_success:
assume_success_timeout: 0
file_post_name: Filedata
post_params: [object Object]
file_types: *.jpg;*.jpeg;*.gif;*.png
file_types_description: Image File
file_size_limit: 5000
file_upload_limit: 0
file_queue_limit: 0
debug: true
prevent_swf_caching: true
button_placeholder_id: imgSpanButtonPlaceholder
button_placeholder: Not Set
button_image_url: /static/image/common/uploadbutton.png
button_width: 100
button_height: 25
button_text:
button_text_style: color: #000000; font-size: 16pt;
button_text_top_padding: 0
button_text_left_padding: 0
button_action: -110
button_cursor: -2
button_disabled: false
custom_settings: [object Object]
Event Handlers:
swfupload_preload_handler assigned: true
swfupload_load_failed_handler assigned: true
swfupload_loaded_handler assigned: false
mouse_click_handler assigned: false
mouse_over_handler assigned: false
mouse_out_handler assigned: false
file_dialog_start_handler assigned: true
file_queued_handler assigned: true
file_queue_error_handler assigned: true
upload_resize_start_handler assigned: false
upload_start_handler assigned: true
upload_progress_handler assigned: true
upload_error_handler assigned: true
upload_success_handler assigned: true
upload_complete_handler assigned: true
debug_handler assigned: true
Support:
Load: Yes
Image Resize: No

SWF DEBUG: SWFUpload Init Complete
SWF DEBUG:
SWF DEBUG: ----- SWF DEBUG OUTPUT ----
SWF DEBUG: Version: 2.5.0 FP9 2010-02-17 Beta 3
SWF DEBUG: movieName: SWFUpload_0
SWF DEBUG: Upload URL: http://bbs.xxxx.com/misc.php?mod=swfupload&action=swfupload&operation=upload&fid=72
SWF DEBUG: File Types String: *.jpg;*.jpeg;*.gif;*.png
SWF DEBUG: Parsed File Types: jpg,jpeg,gif,png
SWF DEBUG: HTTP Success: 0
SWF DEBUG: File Types Description: Image File (*.jpg;*.jpeg;*.gif;*.png)
SWF DEBUG: File Size Limit: 5120000 bytes
SWF DEBUG: File Upload Limit: 0
SWF DEBUG: File Queue Limit: 0
SWF DEBUG: Post Params:
SWF DEBUG: type=image
SWF DEBUG: hash=44bce5db18963b7da4f22a938d165419
SWF DEBUG: uid=2461
SWF DEBUG: ----- END SWF DEBUG OUTPUT ----
SWF DEBUG:
SWF DEBUG: Stage Resize:100 by 25
SWF DEBUG: Button Image Loaded
SWF DEBUG: Stage Resize:100 by 25
SWF DEBUG: Event: fileDialogStart : Browsing files. Multi Select. Allowed file types: *.jpg;*.jpeg;*.gif;*.png
SWF DEBUG: Select Handler: Received the files selected from the dialog. Processing the file list...
SWF DEBUG: Event: fileQueued : File ID: SWFUpload_0_0
SWF DEBUG: Event: fileDialogComplete : Finished processing selected files. Files selected: 1. Files Queued: 1
SWF DEBUG: StartUpload: First file in queue
SWF DEBUG: Event: uploadStart : File ID: SWFUpload_0_0
SWF DEBUG: StartUpload(): Upload Type: Normal.
SWF DEBUG: Global Post Item: type=image
SWF DEBUG: Global Post Item: hash=44bce5db18963b7da4f22a938d165419
SWF DEBUG: Global Post Item: filetype=.jpg
SWF DEBUG: Global Post Item: uid=2461
SWF DEBUG: ReturnUploadStart(): File accepted by startUpload event and readied for standard upload. Starting upload to http://bbs.xxxx.com/misc.php?mod=swfupload&action=swfupload&operation=upload&fid=72 for File ID: SWFUpload_0_0
SWF DEBUG: Event: uploadProgress (OPEN): File ID: SWFUpload_0_0
SWF DEBUG: Event: uploadProgress: File ID: SWFUpload_0_0. Bytes: 77374. Total: 77374
SWF DEBUG: Event: uploadError: HTTP ERROR : File ID: SWFUpload_0_0. HTTP Status: 500.
SWF DEBUG: Event: uploadComplete : Upload cycle complete.
Error Code: HTTP Error, File name: 140400yj5jcc35w3idfkmk.jpg, Message: 500

回复讨论(解决方案)

HTTP Status: 500 就是服务器上PHP造成的，出现了严重错误
可能是你上传的文件大小超过了 php.ini 中的限制

和文件大小没关系的，传多大的都一样；这个问题是在换成子域名后出现的，估计和flash跨域有关系

估计有什么用？何况还是乱估计！
HTTP Status: 500 是服务器发出的，可见请求已经到达了服务器
既然已经到达了服务器，那么就与域名无关了

之所以说估计是因为之前另一个站换域名也出现这个问题，并不是乱估计
500谁都知道是服务器内部错误，但是这个错是flash爆出来的，所以猜测flash内部出错

而且删掉那个PHP文件了还是报500，合理吗

删掉PHP文件报500可以
用firebug查看访问信息

swf里面放的 flash文件不支持跨域

已解决了，就是flash跨域的问题

删掉PHP文件报500可以
用firebug查看访问信息

用firebug 看不了flash内部的请求的