i am facing problem with some of my users when they try to send a message by using OWA they are getting the following error "Microsoft Exchange Issued an unexpected response 12030" i have exchage server 2007 running on Windows server 2008.

What Service Pack and Rollup is Exchange? What type of clients are having problems? ( IE, others?) (Windows versions?) Are you using S/MIME? Does the problem happen to external and internal clients? ( Using ISA?) Anything in the event logs or IIS logs? Can you run ExBpa against the server?

12030 (ERROR_INTERNET_CONNECTION_ABORTED): The connection with the server has been terminated. It could cause by the server not sending proper HTTP headers. This includes cases where no headers were sent and where the connection was closed inappropriately Check info: 1. The issue doesnt happen to all users? 2. Have users set up a proxy server in the Internet Explorer? 3. Please increase the diagnostic logging level on the following categories, and reproduce the issue, see if theres any error info in the application log on the CAS server MSExchange OWA\Core MSExchange OWA\ConfigurationJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

How's the case?James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

1. problem is comingonly withfew users2. There is no proxy settings

If the issue doesnt happen to problematic users with fine users machines, the cause would be the problematic users machines If the issue happens to problematic users with fine users machines as well, the cause would be the problematic users mailboxes. Please try to move the problematic users mailboxes into other mailbox database, which can fix certain corruption of mailbox James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

what i monitored it is problem with internet Explorer Build 7.0.6002.18000, how to update I.E 7 Mnually on windows Vista PCSbut i donot want to upgarde to i.e 8 because our oracle based application is not compitible with i.e 8

Is the issue happened to all IE7, including on the brand new test machine?James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

yes it is happening on onlymachines having IE 7 not allbut some of them.

Ok. If the problematic users hadnt have issue on the fine users machine, you could narrowe down the cause to the problematic users machine, but are IE 7 the root cause? I think its uncertain, please try to reset the IE setting, disable all Non-Microsoft services and startup items (Reboot). If the issue still persist, please recreate the windows profile, see if the issue still persist James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

Thanks JamesI will do the steps and let you know if problem occures again.