Server is not recognising users passwords

Our Red Hat Linux server is having problems logging established users onto the network! There was a proxy server problem the previous day and the proxy setting was changed? Any Ideas what could be happening. The night before it work and then in the morning half of the users couldn't log on?

From serverfault Baxter Tyler

• Then you should first try to check what kind of error does the smbclient return, use:

  smbclient -L //localhost -U valid-user
  

  on server.

  If this doesn't give you any clues about the problem, check logs, to find where they are placed do the following:

  $ grep '\<log\>' /etc/samba/smb.conf
          log file = /var/log/samba/log.%m
          log level = 2
  

  check the generic log file (in this example /var/log/samba/log.smbd) and then machine specific file (/var/log/samba/log.samba-server-name)

  Baxter Tyler : Thanks will give it a try!
  From Hubert Kario