[Condor-users] AUTHENTICATE: handshake failed -- why ?

[Thomas Lisson <lisson@xxxxxxxxxxxxxxxxx>]

hello

i have some trouble in my Shadowlog. Why are that sockets closed when 
condor tries to write buffer?
That problems don't appear every time. Anyone an idea?

1/6 11:36:35 (6428.61) (1381): condor_write(): Socket closed when trying 
to write buffer
1/6 11:36:35 (6428.61) (1381): Buf::write(): condor_write() failed
1/6 11:36:35 (6428.61) (1381): AUTHENTICATE: handshake failed!
1/6 11:36:35 (6428.61) (1381): Authentication Error
AUTHENTICATE:1002:Failure performing handshake
1/6 11:36:35 (6428.61) (1381): Failed to update job queue!
1/6 11:36:35 (6428.61) (1381): **** condor_shadow (condor_SHADOW) 
EXITING WITH STATUS 100

my Schedlog says
1/6 11:36:35 DC_AUTHENTICATE: attempt to open invalid session 
condor1:32100:1105007629:171, failing.

thanks
Thomas Lisson
RWTH-Grid