详细问题描述如下：
当需要从备份磁带恢复邮件数据库到邮件服务器的RDB恢复专用数据库时，初期可以进行，但是2，3个小时以后报错说恢复失败。DPM服务器的报错日志如下，Exchange服务器没有报错。这种恢复以前顺利进行过2此，这次一直报An existing connection was forcibly closed by the remote host。Internet搜索不到有效的解决方法。
经过检查需要恢复的邮件数据库是勾选可覆盖的，循环日志也是勾选的。备份的邮箱数据库大小是300多G，磁带容量是800G，备份文件在一盘磁带上
错误信息如下：
Affected area: DAG1-DB01
Occurred since: 2013/11/29 19:45:48
Description: The recovery jobs for Exchange Mailbox Database DAG1-DB01 that started at 2013年11月29日 18:06:48, with the destination of XXXXX.XXX.XXX, have completed. Most or all jobs failed to recover the requested data. (ID 3111)
(ID 2019 Details: An existing connection was forcibly closed by the remote host (0x80072746))
More information
Recommended action:
On the Jobs tab in the Monitoring tasks area, group jobs by type to view details of the recovery jobs.
Retry the recovery job...
Resolution: DPM automatically changes this alert's status to inactive 10 days after it is issued.To dismiss the alert, click below
Inactivate
