Some users connect and others do not, why?

hi,
Some users can not log in openfire and other User can, why? we are using the clientand pindgin pandion and neither connects.
thanks,

jcb

You can’t expect an answer if you give only so much information “it doesn’t work”. For me it connects for everyone, so how can i help you? Please provide more information on what is your network setup, how are you trying to connect and how users who are able to connect are different from the ones who can’t.