For some strange reason, my iMac & Macbook Pro are no longer connecting via the network. Has anyone a solution please?

I recently rebooted the iMac and reinstalled Mavericks, running, 10.9.4 on both this and the Pro. Now when I try to send files from one to the other I get Connection Failed. I've tried rebooting the router, I've also done diagnostics re network on both. Each can 'see' the other in that they are on the list but simply won't communicate. Help would be appreciated as it's a bit of a bug bear using flash drives to transfer files across.
Thanks.
(The Macbook Pro is a 17" Mid 2009, if that makes any difference)

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar at the top of the screen. Click the Clear Display icon in the toolbar. Then take one of the actions that you're having trouble with. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

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