Are you using an internal SUS or receiving updates from Apple?

What is the CatalogURL?

Lisa is right have a look at the plist in /Library/Preferences/ and make sure it's correct. I had this on the past and did my head in for a while :(

Lisa- I had previously been using an internal SUS but I had reset the Mac to use Apple's servers.

Are you able to see the catalogue in a web browser?

Do you mind sharing the current value of CatalogURL (you can do a defaults read of com.apple.SoftwareUpdate)

When i read the CatalogURL, i get the response:

The domain/default pair of (/library/preferences/com.apple.SoftwareUpdate, CatalogURL) does not exist

When I try to access the sucatalog in a web browser, it gives me a 404.

Try this:

sudo defaults read /Library/Preferences/com.apple.SoftwareUpdate CatalogURL

I still receive the same response

Do you have an internal SUS? Is it running 10.9?

Also, if you run the below it should revert the mac to apples sus's:

sudo JAMF removeSWUsettings

Do you have an internal SUS? Is it running 10.9?

Yes

Also, if you run the below it should revert the mac to apples sus's:

Just tried this, still recieve the NSURLErrorDomain error

Hmmm.. Any proxies in place? Does the macs network settings look ok?

Ahh this old chestnut.

I used to get this a lot on our depreciated OS X SUS. It turned out that if a computer didn't need updates, it would return that exact error. If an update was available, then it would work ok. I used to reset the OS X SUS on a regular basis: it would work for a while and start doing this over and over.

My solution was to rip the entire thing out and replace it with a reposado / margarita combo server. Worked like a dream since then.

The weird thing about that though, is that the Mac DID actually have a new update available (ARD 3.7.2) when it first encountered the error.

I suspect that something went weird during the upgrade from 10.6 to 10.9, as i have many other Mac clients still on 10.8.5 that use our SUS and don't have issues.