CIS 4.0 32: Unable to establish dialup connection after installing CIS

After installing CIS 4.0 it is not possible to establish a dialup connection using the XS W14 UMTS stick from 4G Systems. The dialup application (XSManager) shows an error “Limit reached” which is not documented. However it is still possible to establish a connection manually by using the (precreated) dialup connection in Windows.

System:

Dell Inspiron 6400 Notebook
Windows XP SP2

Try to disable the options “Block fragmented IP datagrams”. You may do it by the following steps: go to Firewall->Advanced->firewall behavior setting->Advanced and uncheck checkbox “Block fragmented IP datagrams”. Tell me about the result, please.