2557516 - communication error: Error during servlet communication / configuartion failed

An attempt to add a development system ends up in receiving the error:

communication error: Error during servlet communication / configuartion failed:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE TCSMessage SYSTEM "http://<NWDI-FQDN>:5xx00/TCS/TCSDeployServlet.dtd">

<TCSMessage>

    <message>

        <exception>

            Illegal_servlet_call._Please_look_into_the_engine_log_for_more_details.

        </exception>

    </message>

</TCSMessage>

The following messages are visible in the CMS trace:
 *****
NWDI_CMSADM Thread[HTTP Worker [@xxxxxxxxxx],5,Dedic~ com.sap.cms.tcs.beans.ume.UserAuthority   User: NWDI_CMSADM
NWDI_CMSADM Thread[HTTP Worker [@xxxxxxxxxx],5,Dedic~ com.sap.cms.tcs.beans.TCSDeployServlet <--- exiting hasDisplayPermission (true)
NWDI_CMSADM Thread[HTTP Worker [@xxxxxxxxxx],5,Dedic~ com.sap.cms.tcs.beans.TCSDeployServlet   error input validation: parameter DEPPWD ==> the value contains double dot '..'
NWDI_CMSADM Thread[HTTP Worker [@xxxxxxxxxx],5,Dedic~ com.sap.cms.tcs.beans.TCSDeployServlet   error input validation: parameter CBSPWD ==> the value contains double dot '..'
NWDI_CMSADM Thread[HTTP Worker [@xxxxxxxxxx],5,Dedic~ com.sap.cms.tcs.beans.TCSDeployServlet   error input validation: parameter SDMPWD ==> the value contains double dot '..'
 *****

NetWeaver Development Infrastructure

NetWeaver Application Server Java

NWDI_CMSADM, user, development, configuration, CMS, NWDI, track,  com.sap.cms.tcs.beans.ume.UserAuthority, error, during, servlet, communication , KBA , BC-CTS-CMS , Change Management Service , Problem