webservice call failed during execution (SSL and certificates) on NetWeaver 7.30

Hey experts,

i need your help!

We make webservice calls to sap me with our own software.

We connect to our software via SSL and certificates e.g. https://host:50001/XMII/CM/POD/MEDialogsWeb.irpt

At the beginning the software runs without any problems and than we become the following message on all our webservice:

thats the webservice configurations

(configuration - connectivity - single service administration):

(configuration - security - authentication and single sign-on)

if we restart the software after the error display, the webservice call runs successfully again.

is it a timeout?

can anybody help us?

Thanks,

Markus

our system info:

NetWeaver 7.30 Java

SAP ME 6.0

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software runs log looks as following

software doesn't runs log looks as following

security Log Entry

more info from security_00.0.log

#2.0 #2014 06 06 14:51:17:136#+0200#Warning#/System/Security/WS#

com.sap.ASJ.wssec.020142#BC-ESI-WS-JAV-RT#tc~sec~wssec~service#C0000A650AD826FF0000000100000BEC#3855850000000005#sap.com/me~ws#com.sap.engine.services.wssec.authentication#Guest#0##207092CAED7111E3A01A0000003AD5EA#23386e31ed7911e39d560000003ad5ea#23386e31ed7911e39d560000003ad5ea#0#Thread[HTTP Worker [@648881277],5,Dedicated_Application_Thread]#Plain##

Received unsupported callback: com.sap.engine.interfaces.security.auth.SetLogonTicketCallback

Received unsupported callback: com.sap.engine.lib.security.http.HttpSetterCallback

Read data of type username and value  MEFLEX from wsse:Security header and set on module javax.security.auth.callback.NameCallback

Read data of type username and value   from HTTP header and set on module javax.security.auth.callback.NameCallback

Read data of type password and value  xxx from wsse:Security header and set on module javax.security.auth.callback.PasswordCallback

Read data of type password and value  xxx from HTTP header and set on module javax.security.auth.callback.PasswordCallback

Authentication for web service ShopOrderService, configuration ShopOrderService using security policy BASIC*SSO2*_*_*ws failed: Cannot authenticate the user.. (See SAP Note 880896 for further info).

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