Free/Busy not working from Office 365/Exchange Online to On-Premise Exchange / Hybrid Configuration – “The external recipient’s server could not be determined” “No information” (You forgot to iisreset)


You have successfully deployed a Hybrid Configuration between your on-premises Exchange 2010 SP3 Organization and Exchange Online. Everything works as it should, except for Free/busy look-ups made from Exchange Online mailboxes to a mailbox that still resides on-premise.

You have verified that the following is OK:

  1. You have run ExRCA diagnostics using , selected the Office 365 tab and then Free/busy tests. You simulate Free/busy lookup from Online to On-premise and it works with all green lights.
  2. You have also followed all the troubleshooting steps presented in this Microsoft Knowledge Base article: – all with successfull results.

Still, when attempting to do Free/busy lookups from Online to On-premise, you get the message in Outlook or OWA saying “No information” with the reason “The external recipient’s server could not be determined”.


Settings made during your Hybrid Configuration and/or extended troubleshooting of this error have not been fully commited to Internet Information Server (IIS). Allthough the diagnostics (ExRCA etc) say that your configuration is right, vital configuration is not yet effective.


First step in resolving Free/busy errors is to follow the two steps mentioned in the Introduction to this post (ExRCA diagnostics and following KB2555008 – see above). If that does not work:

Doing iisreset on your CAS server publishing EWS/Hybrid could fix this issue.

Plan for a very short outage in Exchange services (OWA/EWS etc) and open the command prompt on your Hybrid CAS server. Then run the command iisreset

After doing IISReset, Free/busy lookups from Online to On-prem should start working within minutes.

I have seen this in the field where we spent days troubleshooting this issue on Exchange 2010SP3 hybrid configurations after finally solving it with this basic, but classic, method – restarting the services. There could of course be other reasons behind the error (i.e related to how Autodiscover is published to the internet), iisreset should not be considered as a “general cure”, but a necessary troubleshooting step if your configuration is done by the book and it still does not work.

166 thoughts on “Free/Busy not working from Office 365/Exchange Online to On-Premise Exchange / Hybrid Configuration – “The external recipient’s server could not be determined” “No information” (You forgot to iisreset)

  1. Phil

    Simply doing an iisreset will not always fix the issue, in fact there are a number of different issues that could be at play here that iisreset will not fix. Considering this causes a brief outage for an entire organization, I think it’s irresponsible to make the blanket statement recommending that iisreset will fix the issue.

  2. Mr. Pink

    I hardly think it’s irresponsible given that he says to do other tests first. The only change I would suggest is the bold bit – say that it may fix the issue rather than will.

    1. admin Post author

      Hi Phil and Mr. Pink,
      Thank you both for your feedback, I agree with both of you on your comments. I have adjusted the post. Thanks for reading my field notes!

  3. Smokes

    Hmm… I wonder if an IISReset /noforce could fix this as well without the outage. Did you try that prior? (I ask because I’m seeing this same issue)

    1. admin Post author

      Hi Smokes, I did not try that. Interesting thought, will try it the next time I see the issue. Feel free to post back if you get the opportunity to try it as well.

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