might be stupid or just a typo but:
is wrong? shouldnt it be:
if its just a typo, please can you goto iis manager, look under "sites" you should see central amin within the list of sites, right click it and select "manage website" and then click on "browse". It should take you to the localhost of central admin:
or just copy pase this into the browser ;)
whats the result? if everything is correct than you should still run into the 503 error.
you could follow this, the person outlines 5 ways for fixing 503. In your case it could be:
5.The last fix I tried was perhaps AD related. Perhaps the Local Security settings had been modified domain wide so that only one
specific account had Allow Batch Logon rights. Perhaps the SP Farm
account, which is the account that runs the app pools, should be added
to the Allow Batch logon rights if it isn’t already there. I applied
the rights to the SP Farm account and this resolved the issue
if that is also not the issue than you need to start looking at the sql server:
Tip: make sure that the app pool account password or user name hasnt changed! if in dout reenter the account details in iis manager for the central admin app pool account!