OVH共享服务器子域名DokuWiki图片上传403错误求助

Hey there, let’s tackle this 403 upload issue with your DokuWiki on OVH’s shared server—total bummer when you’ve followed all the official steps and still hit a wall! Here are some targeted troubleshooting angles and fixes you might not have tried yet:

1. Dig into OVH’s Shared Server-Specific Restrictions #

OVH shared hosts have default guardrails that can block uploads even if your PHP config looks correct:

• File size limits: Even with file_uploads=on, check if upload_max_filesize and post_max_size are set too low (OVH often defaults to 2MB). Add these lines to your .ovhconfig if missing:

  upload_max_filesize = 16M
  post_max_size = 20M
  

• ModSecurity interference: OVH enables ModSecurity by default, which might flag your image uploads as suspicious. Test disabling it temporarily by adding this to your DokuWiki root’s .htaccess:

  <IfModule mod_security.c>
    SecFilterEngine Off
    SecFilterScanPOST Off
  </IfModule>
  

  Note: Only keep this disabled if it fixes the issue—then work with OVH to tweak specific rules instead of leaving it off entirely for security.

2. Fix Directory Permissions (Beyond 777) #

While 777 works for testing, OVH’s shared environment often blocks overly permissive permissions for security. Instead:

• Confirm the data/media directory (and all subfolders) is owned by your FTP user (not root or www-data)—use your FTP client to check ownership details.
• Set directory permissions to 755 and file permissions to 644—this is the secure, OVH-compatible setup that should still allow uploads.

3. Double-Check DokuWiki’s Core Configs #

Head to your conf/local.php file and verify these settings:

• Ensure $conf['mediadir'] points exactly to your data/media folder (no typos or incorrect paths).
• Confirm $conf['allow_upload'] is set to 1 (it should be enabled by default, but it’s worth checking).
• Match $conf['uploadsize'] to your PHP upload_max_filesize (e.g., 16M)—DokuWiki has its own upload limit that might override PHP’s.

4. Test with a Clean .htaccess #

Custom .htaccess rules (either in DokuWiki’s root or your parent domain) can break uploads. Try renaming your current .htaccess to .htaccess.bak and test uploading again. If it works, go through the rules one by one to find the conflicting line.

5. Check OVH’s Firewall and Upload Blocklists #

Log into your OVH Manager and look for these settings:

• Web Firewall: See if any rules are explicitly blocking image uploads.
• File Upload Filters: Some plans block specific extensions by default (even common ones like .png in rare cases)—make sure your image types are allowed.

6. Enable PHP Error Logging for Clues #

A 403 error can sometimes hide a more specific issue. Enable logging in .ovhconfig to get detailed error messages:

log_errors = On
error_log = /path/to/your/dokuwiki/error.log

Make sure the path is writable by your server user, then try uploading again. The log might reveal exactly what’s blocking the upload—like a hidden permission issue or ModSecurity trigger.

If none of these steps resolve the problem, reach out to OVH support directly. They can access server-side logs you don’t have access to, which could uncover things like quota limits or server-specific restrictions you can’t fix on your own.

内容的提问来源于stack exchange，提问作者Mehdi Ayad