android可以真机预览，ios报这个错误。
主要是因为使用的sever IIS7 默认使用的SSL2.0，而iOS微信需要使用TLS 1.2。只要修改一下，启用server 的TLS 1.2就可以了。具体方法可以参考/kb/a433/how-to-enable-tls-1_2-on-windows-server--r2.aspx
简单来说就是：打开注册表编辑器，找到HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols 在下面新建项 TLS 1.2，在TLS1.2 下面建立Client和Server2个项，在2各项下面分别添加DisabledByDefaultEnabled， 前者为0 后者为1 。改好之后重启服务器即可。
或可以把下面的代码复制到PowerShell里运行一下，然后重启服务器。
# Enables TLS 1.2 on windows Server R2 and Windows 7
# These keys do not exist so they need to be created prior to setting values.
md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2"
md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server"
md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client"
# Enable TLS 1.2 for client and server SCHANNEL communications
new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" -name "Enabled" -value 1 -PropertyType "DWord"
new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" -name "DisabledByDefault" -value 0 -PropertyType "DWord"
new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client" -name "Enabled" -value 1 -PropertyType "DWord"
new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client" -name "DisabledByDefault" -value 0 -PropertyType "DWord"
# Disable SSL 2.0 (PCI Compliance)
md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server"
new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server" -name Enabled -value 0 -PropertyType "DWord"
# Enables TLS 1.2 on Windows Server R2 and Windows 7 # These keys do not exist so they need to be created prior to setting values. md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2" md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client" # Enable TLS 1.2 for client and server SCHANNEL communications new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" -name "Enabled" -value 1 -PropertyType "DWord" new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server" -name "DisabledByDefault" -value 0 -PropertyType "DWord" new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client" -name "Enabled" -value 1 -PropertyType "DWord" new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client" -name "DisabledByDefault" -value 0 -PropertyType "DWord" # Disable SSL 2.0 (PCI Compliance) md "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server" new-itemproperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server" -name Enabled -value 0 -PropertyType "DWord"
