I just noticed I neglected to add the port 443 to the Node IP and now it seems to respond!
* timeout on name lookup is not supported
* About to connect() to 10.130.172.31 port 443 (0)
* Trying 10.130.172.31...
* connected
* Connected to 10.130.172.31 (10.130.172.31) port 443 (0)
* Server auth using NTLM with user 'OURDOMAIN.com\saf5healthcheck1'
> POST /EWS/Exchange.asmx HTTP/1.1
> Authorization: NTLM TlRMTVNTUAABAAAABoIIAAAAAAAAAAAAAAAAAAAAAAA=
> User-Agent: curl/7.25.0 (x86_64-redhat-linux-gnu) libcurl/7.25.0 OpenSSL/1.0.1j zlib/1.2.3 libidn/0.6.5
> Host: 10.130.172.31:443
> Accept: */*
> Content-Type: text/xml; charset=utf-8
> Content-Length: 0
>
* Recv failure: Connection reset by peer
* Closing connection 0