Information about the 403 exception

403-Forbidden: IIS defines a number of different 403 errors that indicate a more specific cause of the error: • 403.1-execution access is forbidden. 
• 403.2-read access is forbidden. 
• 403.3-write access is forbidden. 
• 403.4-Requires SSL. 
• 403.5-Requires SSL 128. The 
403.6-ip address is rejected. 
• 403.7-Requires a client certificate. 
• 403.8-site access is denied. 
• 403.9-excessive number of users. 
• 403.10-Invalid configuration. 
• 403.11-Password change. 
• 403.12-Deny access to the mapping table. 
• 403.13-The client certificate is revoked. 
• 403.14-Reject directory list. 
• 403.15-Client access permission exceeded. 
• 403.16-client certificate is not trusted or invalid. 
• 403.17-The client certificate has expired or is not yet valid. 
• 403.18-The requested URL cannot be executed in the current application pool. This error code is specific to IIS 6.0. 
• 403.19-CGI cannot be executed for clients in this application pool. This error code is specific to IIS 6.0.