This counts outright rejections of accounting log submissions by this one specific server, which is unusual and often signals a server-side capacity issue, like a full log database, on that particular appliance rather than anything about the session being logged. An admin seeing rejects isolated to one accounting server's row, while other accounting servers accept normally, should check that specific server's storage or database health rather than assuming a broader TACACS+ problem. For example, a dedicated log server nearing its disk quota might start rejecting new records while everything else about the deployment functions normally.