Object reference not set to an instance of an object

We had a client that needed to have several SharePoint subsites published externally. After exposing the sites externally - everything worked fine except for checking documents in/out.

The client would get an error that said:

Object reference not set to an instance of an object

Wow...very descriptive. Thanks Microsoft.

After a little digging - we found that it was tied to Alternate Access Mappings.

Go to SharePoint Central Admin->Operations->Alternate Access Mappings.

Click Edit Public URLs.

Add the FQDN to the internet AAM and choose Ok.

Restart IIS.

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