Repeated "Connection failure"

I am running Tiger 10.4.11. About two weeks ago, I started getting an alert about every half-hour, saying "Connection failure - The server may not exist or is not operational at this time. Check the server name or IP address and try again." According to the Apple support pages, this happens when running Classic (OS 9) in Tiger and trying to access an AppleShare (AFP) server. But I am not running Classic. Any other ideas what might be happening, or how to diagnose this?
 
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