We recently replaced Surfcontrol with Securepoint and turned on user NTLM authentication for the http proxy. We did the same with Surfcontrol/ISA and in the past this worked well.
When a user browses the web through IE7/8/9 no problems occur and passthrough authentication gets done properly. Only when we use firefox the user gets asked for credentials about every 5 minutes, when he inputs his password again internet still works.
I have looked at the NTLM settings in securepoint and all looks well, also the firefox settings are the same as they were with ISA.
Any ideas?
Thanks a lot!