HTTP/1.1 503 Service Unavailable

Posted on 2011-05-03
Last Modified: 2012-05-11
We lost power a few weeks ago and since then when logging into OWA we get HTTP/1.1 503 Service Unavailable. We are in a multi domain forrest and the other domain backend servers are working perfectly. our exchange users can connect fine and IIS is running on the box. I'm at a loss here.

I've gone thru all the steps here with still no resolution.

as a side note.. since the power outage i've been getting the pen icon on my DHCP server
Question by:jgruenwald
    LVL 7

    Expert Comment


    Author Comment

    I dont think thats it.. I can browse locally by http://server/exchange.  But i when i try to login via the FE server i get the HTTP/1.1 503 Service Unavailable error.
    LVL 7

    Expert Comment

    Hi Mate,

    Your statement in the question is little confusin "We are in a multi domain forrest and the other domain backend servers are working perfectly" What is it mean.. some of the domain under the multidomain forest is working even via the FE server?

    Also will you please verify the event log for any related errors ? Becasue the error that you have mentioned here can happen because of verious reason inclusing the Active Directory and the Exchange Availability. See for any DSAccess errors also and other related errors.

    Please also run ExBpa and see for errors...


    Accepted Solution

    Turns out the issue was that the PDC was not pushing WINS info to the FE and its WINS server. I did a push/pull from the local WINS server and it fired right back up.


    Author Closing Comment

    Self Resolved

    Featured Post

    Too many email signature updates to deal with?

    Are you constantly visiting users’ desks making changes to email signatures? Feel like it’s taking up all of your time? Wish you could manage all signatures from one central location, easily design them and deploy them quickly to users? Well, there is an easy way!

    Join & Write a Comment

    Check out this infographic on what you need to make a good email signature that will work perfectly for your organization.
    Find out how to use Active Directory data for email signature management in Microsoft Exchange and Office 365.
    In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Servers >> Data…
    The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

    728 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    18 Experts available now in Live!

    Get 1:1 Help Now