Unusual traffic from your computer network

Proxying your google-search Traffic 

when you tray to re-routing your network over the proxy server, then you use google to search some keywords, google will detect it as un-usual traffic. Google will ask you to enter capcha or you will get
"error page" from google.

is it real error ?,
Nope, however its just google-ways to ensure that you are not machine, because your routing has been changed.

how google identify that you are not machine 

you can check your on your error web-page, that google send you script below :

On IE :

its use to detect your proxy setting, make sure that your traffic changed because of proxy.

on this page, you can see that, when you click "detect setting", your browser will detect your proxy setting and send it to google.

On Firefox : 

 function doNetDetect() {
  saOC.NETDetectNextNavigate();
  location.reload();

Solution

the simplest solution is use other search engine, or always clearing your browser cache and cookie. More advance solution, you can modify your proxy server here. But i suggest to read "how cookie works" first before go there.

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Proxying your google-search Traffic 

when you tray to re-routing your network over the proxy server, then you use google to search some keywords, google will detect it as un-usual traffic. Google will ask you to enter capcha or you will get
"error page" from google.

is it real error ?,
Nope, however its just google-ways to ensure that you are not machine, because your routing has been changed.

how google identify that you are not machine 

you can check your on your error web-page, that google send you script below :

On IE :

its use to detect your proxy setting, make sure that your traffic changed because of proxy.

on this page, you can see that, when you click "detect setting", your browser will detect your proxy setting and send it to google.

On Firefox : 

 function doNetDetect() {
  saOC.NETDetectNextNavigate();
  location.reload();

Solution

the simplest solution is use other search engine, or always clearing your browser cache and cookie. More advance solution, you can modify your proxy server here. But i suggest to read "how cookie works" first before go there.