IMac no longer sharing on home network

I am having problems using my iMac on on my network at home. It is only about 6 months old and all of the features I am having problems with have previously worked without problems.
The main issue appears to be that while my iMac is able to connect to the wifi network no problem, no other devices on the network can see the iMac.
The result is that I cannot locate another macbook on the network to share files with, I cannot wirelessly sync with my iPhone, I cannot use the homesharing feature on iTunes, I cannot use the Remote app on my iPhone to control my iMac.
All these used to work fine and I am concerned that through an update or an accidental setting change I have disabled them. I have gone through all the preferences to make sure they are set to enable the sharing so I would like to know if anyone esle having the same issue and what I can do to fix it.
Thanks

I kept playing with settings and finally fixed the problem.

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