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When we get the below errors in the event viewer on the edge service: A configured transport has failed to start. Transport TLS has failed to start on local IP address 10.x.x.x at port 5061. Cause: Configuration error, low system resources or another program is using the specified port. Can also happen if the IP address has become invalid. Resolution: Ensure that the IP address specified is valid and that no other program is listening on the specified port. Unable to bind for socket. Transport:TLS, IP address: 10.x.x.x, Port:5061. Error:0x80072741 (The requested address is not valid in its context.). Resolution: Ensure that no other program is listening to the specified port and that the IP address is valid. Then most probably the error can be that your IP address got changed and the topology builder is still using the old IP address. This can happen when you are using DHCP instead of static assigning. Resolution: Change the IP in the topology using the topology build...

When we are about to publish topology, if MMC crashes then the probable reason  might be wrong AD preparation. For this first of all remove the configuration store  location and then publish the topology after selecting thee correct CMS     Remove-CsConfigurationStoreLocation

EmailMessage message = new EmailMessage (exchangeService); message.Subject = "test"; message.Attachments.AddFileAttachment( @"test.bmp" ); message.Attachments[0].ContentId = test.bmp@123 ; message.Attachments[0].IsInline = true ; message.Attachments[0].ContentLocation = path; //Image path Without content location and ContentId we will not get the image in the message body. Make sure you add the Content ID in the HTML to get the image.

If you are unable to get the performance metrics of a machine: Running this command from command prompt may help: lodctr /r Check if all are enabled: lodctr /q

1) What are constraints? These are used to constraint(limit) the data that can go into SQL tables There are generally six types of constraints in SQL: NOT NULL Constraint - Check Constraint - Default Constarint - Primary Key Constraint - Unique Key Constraint - Foreign Key Constraint - 2) What are ACID properties? ACID stands for Atomicity, Consistency, Isolation and Durability. Database professionals when evaluating the database, looks at these features of database. Atomicity: Each transaction is said to be atomic. If one part of the transaction fails, entire transaction should fail. Its all or none rule. Consistency: Only valid data should be written into database. If a transaction is executed that violates the Database consistency rules then entire transaction should be rolled back. Database should not leave your transaction in half finished state. Isolation: Database should isolate two concurrent transactions until they are finished. Durability: Any transac...

For this I found a very useful post and here is the link to follow: http://blog.schertz.name/2010/11/lync-and-exchange-um-integration/ and ofcourse the microsoft link is also very useful: http://technet.microsoft.com/en-us/library/bb803622(office.12).aspx

When we install Lync Server and try to import, export or use some other cmdlets, make sure you use Lync server management shell. If you use windows powersell then we will get the errors as mentioned in the title.. Silly but i did it few times this way :)