No free/busy info could be retrieved via RPC, works with VPN

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I have one off-site user with Outlook 2010 connected to an Exchange 2010 server who gets the error " no free/busy info could be retrieved" when she attempts to view other users' free/busy info in the meeting scheduler. She is configured with RPC/HTTPS. The server uses a self-signed cert which is in her root certificate chain. Outlook works fine otherwise - she can even view other users' calendars in the calendar view. If she connects via VPN it works. Scott

Ed Crowley [MVP]

It looks like from your problem post that your issue is with access to the Availability Service, which is a web service. I suspect that she would have similar problems gaining access to her out-of-office settings as well--that would be a good test of my theory. Directly looking at another user's calendar doesn't use the availability service. When she connects via VPN, she's able to see it, so that means the Exchange is working properly but the URL isn't working on the Internet like it does internally.

Ed Crowley MVP " There are seldom good technological solutions to behavioral problems."


Works VPN but doesn't work normally .... that's typically network related. But lets break it down into the major components

On the users PC: is the users IP range defined in AD Sites and Services? AKA, do you know if it's trying the internal URL path or the External URL path? Users not defined on " the corporate network" will attempt the external URL defined in your OAB settings on the CAS. Many corporations dont nessisarily resolve the external URL properly (doens't exist, or returns the external IP which the company firewall doesn't route, etc).

Do a quick-n-dirty hosts file test where you hardmap the external FQDN to the internal IP of one of the CAS servers on the client .... see if that fixes your imediate issue. Maybe even start easier with a ipconfig /displaydns to see what it's tryign to resolve. If everything resolves properly to the right location then IIS doens't discriminate authentication by IP source .... so it's time to start talking with your network team and cleaning up name resolution.

Allen Song


You should check the external url of the Availability Service is working fine for the Internet users. Press Ctrl+right click Outlook icon in System Tray, select Test E-mail AutoConfiguration, uncheck the two options about " Guessmart" , input the password, click Test button, confirm you get the right Availability Service URL.

And then run test-outlookwebservices -identity |fl command in EMS, then check the results.



Allen Song
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