Hi,
We have a network that is completely closed off from the internet. There is a sharepoint 2013 installation and we use office 2013. When we want to checkout a document in sharepoint through word or excel, we get an error that the server cannot be reached. There is also a problem with the contacts sync in outlook.
After a lot of testing we have come to the conclusion that this is a problem with office. You can see more details on the testing in this and in this topic.
I've posted this problem here because this is clearly a office problem and not a sharepoint problem. I hope somebody from the microsoft office team can have a look at this.
Thank you