Has installed the new version and has checked up with it. I am afraid that the problem remained.
Each remote call passes so:
1. Request #1:
POST http://...:.../... HTTP/1.1
CONTENT-LENGTH: 158
Host: ...:...
Proxy-Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache
data...
2. Answer #1:
HTTP/1.0 407 Proxy Authentication Required
Server: squid/2.6.STABLE5
Date: Sat, 09 Jan 2010 09:46:23 GMT
Content-Type: text/html
Content-Length: 1343
Expires: Sat, 09 Jan 2010 09:46:23 GMT
Proxy-Connection: close
html text with error description...
3. Request #2 (which it is called implicitly for me):
POST http://...:.../... HTTP/1.1
Content-Length: 158
Host: ...:...
Proxy-Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache
Proxy-Authorization: Basic ...
data...
4. Answer #2:
HTTP/1.0 200 OK
Content-Length: 435
Proxy-Connection: keep-alive
right data