Session management error

[prostetnic]

Hello,
I've built GUI app (linked with Qt sdk libs 4.6.2) on Ubuntu workstation and I am trying to run that app on Red Hat EL 5.7.
That worked before with older version of RedHat.
The errors I see now:

Qt: Session management error: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
./PearlQt: symbol lookup error: ./PearlQt: undefined symbol: _Z13qFlagLocationPKc

What host authentication protocols?
Any idea what the problem is?