ISA 2004客户不能访问某些url.

try way 1:

ISA 2004 console > Configuration > Add-Ins > Web Filters tab > properties
of compression Filter > select Enable this filer. > Ok > Apply.

try way 2:

ISA2004 error 12217,Help me!!
取消验证正则化
如果URL有高位字符请求，同样要取消选框
把HTTP过滤器禁用了试试

详情请见：
http://www.microsoft.com/china/technet/prodtechnol/isa/2004/plan/httpfiltering.mspx
 
 Error Code: 500 Internal Server Error. The request was rejected by the HTTP Security filter. Contact your ISA Server administrator. (12217)

1. Start the ISA Server Management tool.

2. Expand ServerName, where ServerName is the name of your ISA Server computer.

3. Click Firewall Policy, click the Web publishing rule that you created , and then click Edit Selected Rule.

4. Click the Traffic tab, click Filtering, and then click Configure HTTP.

5. Click to clear the Block high-bit characters check box, and then click OK two times.

6. Click Apply to update the firewall policy, and then click OK.

其实上面解决的问题就是，通过ISA发布网站之后，Web地址里不能转发高位字符的问题。默认是被ISA给Block掉了！