Cannot connect through proxy authentication

I have connection through proxy (with authentication) problem. . Here is my Test internet connection log if I set porxy port to 443- Platform: Windows-6.1 Proxy Type: HttpProxy Proxy Server: proxy.tcs.com Proxy Port: 443 Proxy User: india\129692 Proxy Has Password: true verify depth 0 verify mode 3 Connecting to www.mendeley.com (secure: 0, backend: Qt) - OK Done (407) verify depth 0 verify mode 3 cert 0 www.mendeley.com (Websense Engineering) :-2091346224 is valid? 1 Connecting to www.mendeley.com (secure: 1, backend: Qt) - OK Done (302) No SSL config Connecting to www.mendeley.com (secure: 0, backend: Platform) - OK Done (407) No SSL config Connecting to www.mendeley.com (secure: 1, backend: Platform) - Failed (Unable to send HTTP request to (0) : 0) verify depth 0 verify mode 3 Connecting to s3.amazonaws.com (secure: 0, backend: Qt) - OK Done (407) verify depth 0 verify mode 3 cert 0 s3.amazonaws.com (Websense Engineering) :-627607240 is valid? 1 Connecting to s3.amazonaws.com (secure: 1, backend: Qt) - OK Done (307) No SSL config Connecting to s3.amazonaws.com (secure: 0, backend: Platform) - OK Done (407) No SSL config Connecting to s3.amazonaws.com (secure: 1, backend: Platform) - Failed (Unable to send HTTP request to (0) : 0) If I set the proxy port to 8080, I get the following log - Platform: Windows-6.1 Proxy Type: HttpProxy Proxy Server: proxy.tcs.com Proxy Port: 8080 Proxy User: india\129692 Proxy Has Password: true verify depth 0 verify mode 3 Connecting to www.mendeley.com (secure: 0, backend: Qt) - OK Done (407) verify depth 0 verify mode 3 Connecting to www.mendeley.com (secure: 1, backend: Qt) - Failed (Proxy requires authentication : 0) No SSL config Connecting to www.mendeley.com (secure: 0, backend: Platform) - OK Done (407) No SSL config Connecting to www.mendeley.com (secure: 1, backend: Platform) - Failed (Unable to send HTTP request to (0) : 0) verify depth 0 verify mode 3 Connecting to s3.amazonaws.com (secure: 0, backend: Qt) - OK Done (407) verify depth 0 verify mode 3 Connecting to s3.amazonaws.com (secure: 1, backend: Qt) - Failed (Proxy requires authentication : 0) No SSL config Connecting to s3.amazonaws.com (secure: 0, backend: Platform) - OK Done (407) No SSL config Connecting to s3.amazonaws.com (secure: 1, backend: Platform) - Failed (Unable to send HTTP request to (0) : 0)