WHMCS：订单接受遇到的问题 - 卷曲错误：无法连接到主机Url

For the past four hours I have been trying to configure TCAdmin to work with whmcs. I set up the server in the server setting of WHMCS and added all the configurable options. I got my first demo order and when I select "Accept Order" I get this error:

Order Accept Encountered Problems Curl error: couldn't connect to host Url: http://xx.xx.xxx.xxx:8880/billingapi.aspx

For some reason WHMCS can't connect, but when I connect I get this: "Visit http://help.tcadmin.com for help". I tried that. Still no luck.

So I went into my server, found the billingapi.aspx file and it said this: This is a marker file generated by the precompilation tool, and should not be deleted!"

Does anyone have any suggestions or solutions? All help is appreciated :)

-Max

Curl is failing to connect but you think it should be able to? There are a few things to check:

• Is the address being passed to Curl really right? (It's so easy to get this wrong!)
• Is the target host reachable from the host making the request (the origin)? Firewall rules can cause all sorts of strange problems here. Check if you can do a read-only request from the origin and get through that way.
• Is the target port on the target host accessible from the origin? Again, it's the firewall, and port 8880 is not one that I'd expect to normally be a permitted outgoing target in an aggressive firewall regime; a specific rule may well be needed.
• Is there a problem with DNS? Hopefully not, but if name resolution itself keeps failing then that might be a significant issue. (This won't be the case if you use an IP address instead of a DNS host name, but that can cause the request to fail in other ways — such as if the target hosts many sites — so don't jump to conclusions here.)

Other problems that are theoretically possible (e.g., bad request contents, wrong path in the URL) would give different error messages.