SSO ISSUE in production server

hi all

i have configured sso in dev quality those are working fine. now i have done it in Production .

while maintaing the jco destinations created the model data jco using logon ticket and meta data jco using uidpw.

for some time model data jco is working fine but some other time i am getting the error

com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: This system rejects all logons using SSO tickets .

we maintained technical systems in Central SLD(solution Manager).

No problem with Meta Data jco.

Why happenin like this......i have maintained Login accepet and create values properly in RZ10 in R3.

plz let me know why its happening like?

thankyou

swapma