Can no longer connect to network server after upgrading dsl modem

While I was working on a file that resides on a network server, the router was powered down so on reboot it would communicate with a dsl modem . After the router was power up I could not reconnect to the server.
I have internet access
The mini can see the server in the finder and the server sees the mini
This is not a wireing issue.
When I try to connect I get this message:
"The file server uses an incompatible version of the AFP Protocol. You cannot connect"
The server is an old mac running os 9.1. I've read that 9.1 is not compatible with 10.4.8. But it worked just fine this morning.
There are other macs (cubes) running 9.2 I can connect to them.
I've tried restarting and logging on as a differernt user. no change

Thanks for your help
I made no changes to the mini or the server.
The router was shut down then on restart the new (replaced modem) was configured by using another mac on the network (not the file server)
Once the router and modem were online again, other macs running 9.2 were accessing the file server as usual. The mini was not.
I had been working on a file that resides on the server. I was not warned that the router was going to be shut down. When I saved the file I got the beach ball then error message.
It'll be next week before I'm in the office agin. I'll report back then. Thanks

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Message was edited by: Gary Sumlak

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