PROBLEM: Sharepoint 2013 Forbidden 503 Service Unavailable

PROBLEM: Sharepoint 2013 Forbidden 503 Service Unavailable
FIX: Update the domain password of the Sharepoint Services
ROOTCAUSE: A compulsory Domain password change created an issue in the Sharepoint Services, you have to manually update/set the service password.
COUNTERMEASURE: Create an SPADMIN account in the domain and set the password not to expire.

BACKGROUND:

Last month, I consolidated all my server needs at home into 1 server.  I am using a Dell Poweredge III SFF as the physical server with 2 CPU, 32GB of Memory and 8 2.5” drives. I bought this from ebay for half the original cost.  The purpose of the server was for learning about the following topics: Hyper-V, Windows 2012, Exchange 2013, Sharepoint 2013, Lync 2013, SQL 2012. This is only a hobby and not exactly job related.   Yes, I created a complex situation at home just to occupy my mind when I’m bored.  This is more of a “problem solving journey” than anything else. [poweredge notes] .  If you are in the same journey, please feel free to exchange notes here.

Sharepoint site was running like a champ for weeks and then all of a sudden, “forbidden 503” error.  The Sharepoint server is a Hyper-V client inside the Poweredge 2930 III server.  I had 8 drives running/designated for each specific server. The backend of the Sharepoint server database was a virtual disk on a separate drive within the physical server.   The Domain server was the Hyper-V host and the physical network connection was tied into the physical Linksys Network switch.  Inside the Hyper-V Host is the virtual switch that connects all the Hyper-V clients ie domain, exchange and sharepoint.  For sharepoint to properly work, all the interconnected systems must be fully functioning. In short, the forbidden 503 error was not an easy problem to troubleshoot.

Virtual Machines:

When I setup Sharepoint 2013 for testing, I was using the domain\administrator account to run the service [this is the mistake]. W2012 domain forced a password change of the administrator account in which I did and then a few days later, I found out, the Sharepoint site was down.

Two symptoms:
1. Sharepoint Site “Forbidden 503 Service Unavailable”
2. Central Admin was unavailable

SOLUTION:
Step By Step:
1. Go to Sharepoint Server Services
2. Update the Sharepoint Service Account
3. From the command prompt, Type iisreset  /restart

Windows Service Account-password needs manual update

IIS Application Pool Failed to start [lesson learned: do not use the Administrator account]