This identifier contains a list of custom error messages. Each string in the list specifies an error code and subcode for the custom message, what the specific error text and subcode error text is to be, and whether the custom message is supported by file or URL, or just by file. Each string is in the format ErrorCode, ErrorSubcode, ErrorText, ErrorSubcodeText, followed by another comma and either a 0 for file and URL support, or a 1 for file support only.
| Data type | MULTI_SZ |
| Default inheritance | Not inheritable |
| User type | IIS_MD_UT_SERVER |
This identifier is available at the following metabase keys:
| Metabase Path | Key Type |
| /LM/W3SVC/INFO | IIsWebInfo |
CustomErrorDescriptions, MD_CUSTOM_ERROR