微软解决方案是：
1， 从SQL Server 2005 外围应用配置器上配置本地连接和远程连接为tcp/ip方式及name Pipes；
2， 启用 SQL Server Browser 服务；
3， 在 Windows 防火墙中创建例外.
具体步骤请参见：
http://support.microsoft.com/kb/914277/zh-cn
http://support.microsoft.com/kb/914277/zh-tw
如果以上方法还不行的话，就是因为ipsec指派了之后，DB A和DB B不能相互解析到自己的主机名称，所以造成复写写不进去。
比如：在dtpcdb02中，ping dtsdb01的ip地址是通的，但是ping dtsdb01的DNS则ping不通。
终极解决方案：在两台机器的host上加上对方的ip地址和名称。
步骤：
1， 搜索hosts文件：C:\windows\system32\drivers\etc\hosts;
2， 用记事本打开，按下面进行添加。
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
10.91.50.46 dtsdb01
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
10.91.50.46 dtsdb01
