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Integration issue

Hi Friends, We are accessing page on the portal and the below given error is thrown directly to the customer on the page. Error: Error occurred while loading a Visualforce page. First, We have written apex class and V.f page .In apex class I making request to the webservices on the server and the response which I get is displayed in Iframe to the customer. This works fine when endpoint URL is without SSL(meaning Http). No error However,It doesn't when we have Https (meaning with SSL). It looks like some problem on the server with SSL Because I get an error,Unable to pass through proxy ,Https service 1.0 unavailable(Captured in debug logs ,not shown to the customer).The one which is shown to the customer is Error: Error occurred while loading a Visualforce page .Is this a standard error message whenever Salesforce is not able to load page? Any idea why debug logs is generating the following error message when we are trying to access web services on the server I get an error,Unable to tunnel through proxy. Proxy returns "HTTP/1.0 503 Service Unavailable". Any insights on this will be greatly appreciated Thanks, Trick
Jia HuJia Hu
Based on my understanding, you can call web service outside Salesforce with Http, but when calling the same service with Https you got the error.

It this right?

If this is the case, first make sure your Salesforce can communicate with your web server with Https.
Check the log in the server side to figure out the problem.
Thanks,for your reply. I have got in touch with my server guy.In the meantime. we are trying Http and Https both from within the salesforce. If the salesforce is not able to communicate with the server then what do you suggests?.Do we need to add salesforce datacenters IP addresses on the server and configure firewall? What do you suggest? Any help on this will be highly appreciated? Thanks, Trick
Jia HuJia Hu
If you can't call web service in Https way. You have to confirm Salesforce can build HTTPs connection with your server first.