Mac Pro will connect to internet but not network with other systems

I have an iMac in my studio reception and a Mac pro and Macbook in my office. All three systems can connect to the internet but the Mac Pro has stopped networking with the iMac. However the iMac can network with the Pro. I have an ethernet cable connection to the Pro (no wi fi card) and I have a wireless router on the iMac which has enabled me to connect the Pro to other systems through wi fi. I also have a PC laptop and the Pro can connect to it via wi fi. Everything was networking properly several weeks ago and as far as I am aware I have not changed any settings. Does anyone have any suggestions on how to resolve this annoying little problem.

Hello there, WoodenToy.
The following Knowledge Base article offers extensive troubleshooting steps for troubleshooting your issue:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Although the entire article is a great resource you may want to focus on the section entitled: "Symptom: My Mac does not connect to the Internet".
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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