| Event Id | 18 |
| Source | IAS |
| Description | An Access-Request was received from client %1 with a signature attribute that is not valid. |
| Event Information | Cause: There is a problem with either the shared secrets or a RADIUS proxy server. Resolution: The administrator must verify that the secrets on the client network access (NAS) and RADIUS servers match exactly. The shared secrets are case sensitive and can run up to 255 characters. |
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