When I click Maintenance plan history, it does not show anything, but when job history is also included, the message as following is almost the same as before. Since full database backup is successful, why should there be any connection issue with transaction log backup?

Message

Executed as user: SCCGOV\sqlagent. Microsoft (R) SQL Server Execute Package Utility Version 10.0.2531.0 for 64-bit Copyright (C) Microsoft Corp 1984-2005. All rights reserved. Started: 8:00:04 PM Error: 2010-06-14 20:00:39.37 Code: 0xC00291EC Source: {3A069612-C02A-44B5-94D5-DBB8D3DF2DCD} Execute SQL Task Description: Failed to acquire connection "Local server connection". Connection may not be configured correctly or you may not have the right permissions on this connection. End Error Warning: 2010-06-14 20:00:39.39 Code: 0x80019002 Source: OnPreExecute Description: SSIS Warning Code DTS_W_MAXIMUMERRORCOUNTREACHED. The Execution method succeeded, but the number of errors raised (1) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors. End Warning Error: 2010-06-14 20:00:56.23 Code: 0xC0024104 Source: Back Up Database Task Description: The Execute method on the task returned error code 0x80131904 (A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)). The Execute method must succeed, and indicate the result using an "out" parameter. End Error Error: 2010-06-14 20:01:14.50 Code: 0xC0024104 Source: Notify Operator Task Description: The Execute method on the task returned error code 0x80131904 (A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)). The Execute method must succeed, and indicate the result using an "out" parameter. End Error Error: 2010-06-14 20:01:30.54 Code: 0xC0024104 Source: {C5EE17C7-FFA2-4974-A08F-D9D5178075D3} Description: The Execute method on the task returned error code 0x80131904 (A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)). The Execute method must succeed, and indicate the result using an "out" parameter. End Error Warning: 2010-06-14 20:01:30.54 Code: 0x80019002 Source: OnPostExecute Description: SSIS Warning Code DTS_W_MAXIMUMERRORCOUNTREACHED. The Execution method succeeded, but the number of errors raised (2) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors. End Warning DTExec: The package execution returned DTSER_FAILURE (1). Started: 8:00:04 PM Finished: 8:01:30 PM Elapsed: 86.25 seconds. The package execution failed. The step failed.