diff --git a/external-dependencies/googletest/Dockerfile b/external-dependencies/googletest/Dockerfile
index baa1b97cc..cffb34465 100644
--- a/external-dependencies/googletest/Dockerfile
+++ b/external-dependencies/googletest/Dockerfile
@@ -1,19 +1,57 @@
 # GoogleTest Installation
 FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
 
-LABEL maintainer="Legatus Team"
-LABEL description="GoogleTest testing framework"
+ARG RME_USERPASS=ctc
+ARG RME_ADMINSRV=10.198.80.75
+ARG RME_PROJECT=guez
+
+# Proxy configuration for air-gapped environments
+ARG http_proxy="http://10.198.80.130:3128"
+ARG no_proxy="localhost,127.0.0.1,defence-elec.de,.defence-elec.de,sl.defence-elec.de,10.198.80.0/23,192.168.133.0/24,141.200.0.0/16,10.184.0.0/15,10.199.101.35,10.199.101.36,10.199.101.158"
+ARG HTTP_PROXY=${http_proxy}
+ARG https_proxy=${http_proxy}
+ARG HTTPS_PROXY=${http_proxy}
+ARG NO_PROXY=${no_proxy}
+
+LABEL author="Legatus Team"
+LABEL project=${RME_PROJECT}
 LABEL version="1.15.2"
+LABEL description="GoogleTest testing framework"
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+# OS and PATH configuration
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
 
-ENV http_proxy=${HTTP_PROXY}
-ENV https_proxy=${HTTPS_PROXY}
-ENV no_proxy=${NO_PROXY}
+# Shell global auf Bash mit sicheren Pipes umstellen
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Originale Repositories durch Nexus Proxies ersetzen
+RUN echo : > /etc/apt/sources.list && \
+    echo -e "Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu\n\
+Suites: resolute resolute-updates resolute-backports\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n\
+\n\
+Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu-security\n\
+Suites: resolute-security\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg" > /etc/apt/sources.list.d/ubuntu.sources
+
+# Create users (install openssl first for password hashing)
+RUN apt-get update && apt-get install -y openssl \
+    && groupadd ctc -g 1445 || true \
+    && groupadd rme -g 1001 || true \
+    && useradd -d /shd/CTC/TOOLS -u 1445 -g ctc -m -p $(openssl passwd -5 ${RME_USERPASS}) ctc || true \
+    && useradd -d /home/rme -u 1001 -g rme -m -p $(openssl passwd -5 ${RME_USERPASS}) rme || true \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL http://${RME_ADMINSRV}/rme/deb_and_rpm_signage_key.pub --output /etc/apt/keyrings/deb_and_rpm_signage_key.asc \
+    && curl -fsSL http://${RME_ADMINSRV}/rme/SL-Netz.crt --output /usr/local/share/ca-certificates/SL-Netz.crt \
+    && update-ca-certificates
 
 ARG GTEST_VERSION=1.15.2
 
diff --git a/external-dependencies/grantlee/Dockerfile b/external-dependencies/grantlee/Dockerfile
index 6e18623f3..15cfca6d9 100644
--- a/external-dependencies/grantlee/Dockerfile
+++ b/external-dependencies/grantlee/Dockerfile
@@ -1,19 +1,57 @@
 # Grantlee Installation
 FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
 
-LABEL maintainer="Legatus Team"
-LABEL description="Grantlee templating engine for Qt6"
+ARG RME_USERPASS=ctc
+ARG RME_ADMINSRV=10.198.80.75
+ARG RME_PROJECT=guez
+
+# Proxy configuration for air-gapped environments
+ARG http_proxy="http://10.198.80.130:3128"
+ARG no_proxy="localhost,127.0.0.1,defence-elec.de,.defence-elec.de,sl.defence-elec.de,10.198.80.0/23,192.168.133.0/24,141.200.0.0/16,10.184.0.0/15,10.199.101.35,10.199.101.36,10.199.101.158"
+ARG HTTP_PROXY=${http_proxy}
+ARG https_proxy=${http_proxy}
+ARG HTTPS_PROXY=${http_proxy}
+ARG NO_PROXY=${no_proxy}
+
+LABEL author="Legatus Team"
+LABEL project=${RME_PROJECT}
 LABEL version="5.3.1"
+LABEL description="Grantlee templating engine for Qt6"
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+# OS and PATH configuration
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
 
-ENV http_proxy=${HTTP_PROXY}
-ENV https_proxy=${HTTPS_PROXY}
-ENV no_proxy=${NO_PROXY}
+# Shell global auf Bash mit sicheren Pipes umstellen
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Originale Repositories durch Nexus Proxies ersetzen
+RUN echo : > /etc/apt/sources.list && \
+    echo -e "Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu\n\
+Suites: resolute resolute-updates resolute-backports\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n\
+\n\
+Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu-security\n\
+Suites: resolute-security\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg" > /etc/apt/sources.list.d/ubuntu.sources
+
+# Create users (install openssl first for password hashing)
+RUN apt-get update && apt-get install -y openssl \
+    && groupadd ctc -g 1445 || true \
+    && groupadd rme -g 1001 || true \
+    && useradd -d /shd/CTC/TOOLS -u 1445 -g ctc -m -p $(openssl passwd -5 ${RME_USERPASS}) ctc || true \
+    && useradd -d /home/rme -u 1001 -g rme -m -p $(openssl passwd -5 ${RME_USERPASS}) rme || true \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL http://${RME_ADMINSRV}/rme/deb_and_rpm_signage_key.pub --output /etc/apt/keyrings/deb_and_rpm_signage_key.asc \
+    && curl -fsSL http://${RME_ADMINSRV}/rme/SL-Netz.crt --output /usr/local/share/ca-certificates/SL-Netz.crt \
+    && update-ca-certificates
 
 ARG QT_VERSION=6.10.2
 ARG GRANTLEE_VERSION=5.3.1
diff --git a/external-dependencies/kdreports/Dockerfile b/external-dependencies/kdreports/Dockerfile
index 6dbdeb81b..616b33ab0 100644
--- a/external-dependencies/kdreports/Dockerfile
+++ b/external-dependencies/kdreports/Dockerfile
@@ -1,19 +1,57 @@
 # KDReports Installation
 FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
 
-LABEL maintainer="Legatus Team"
-LABEL description="KDReports installation for Qt6"
+ARG RME_USERPASS=ctc
+ARG RME_ADMINSRV=10.198.80.75
+ARG RME_PROJECT=guez
+
+# Proxy configuration for air-gapped environments
+ARG http_proxy="http://10.198.80.130:3128"
+ARG no_proxy="localhost,127.0.0.1,defence-elec.de,.defence-elec.de,sl.defence-elec.de,10.198.80.0/23,192.168.133.0/24,141.200.0.0/16,10.184.0.0/15,10.199.101.35,10.199.101.36,10.199.101.158"
+ARG HTTP_PROXY=${http_proxy}
+ARG https_proxy=${http_proxy}
+ARG HTTPS_PROXY=${http_proxy}
+ARG NO_PROXY=${no_proxy}
+
+LABEL author="Legatus Team"
+LABEL project=${RME_PROJECT}
 LABEL version="2.3.0"
+LABEL description="KDReports installation for Qt6"
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+# OS and PATH configuration
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
 
-ENV http_proxy=${HTTP_PROXY}
-ENV https_proxy=${HTTPS_PROXY}
-ENV no_proxy=${NO_PROXY}
+# Shell global auf Bash mit sicheren Pipes umstellen
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Originale Repositories durch Nexus Proxies ersetzen
+RUN echo : > /etc/apt/sources.list && \
+    echo -e "Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu\n\
+Suites: resolute resolute-updates resolute-backports\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n\
+\n\
+Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu-security\n\
+Suites: resolute-security\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg" > /etc/apt/sources.list.d/ubuntu.sources
+
+# Create users (install openssl first for password hashing)
+RUN apt-get update && apt-get install -y openssl \
+    && groupadd ctc -g 1445 || true \
+    && groupadd rme -g 1001 || true \
+    && useradd -d /shd/CTC/TOOLS -u 1445 -g ctc -m -p $(openssl passwd -5 ${RME_USERPASS}) ctc || true \
+    && useradd -d /home/rme -u 1001 -g rme -m -p $(openssl passwd -5 ${RME_USERPASS}) rme || true \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL http://${RME_ADMINSRV}/rme/deb_and_rpm_signage_key.asc --output /etc/apt/keyrings/deb_and_rpm_signage_key.asc \
+    && curl -fsSL http://${RME_ADMINSRV}/rme/SL-Netz.crt --output /usr/local/share/ca-certificates/SL-Netz.crt \
+    && update-ca-certificates
 
 ARG QT_VERSION=6.10.2
 ARG KDREPORTS_VERSION=2.3.0
diff --git a/external-dependencies/log4qt/Dockerfile b/external-dependencies/log4qt/Dockerfile
index 6476eed30..c8f4da115 100644
--- a/external-dependencies/log4qt/Dockerfile
+++ b/external-dependencies/log4qt/Dockerfile
@@ -1,19 +1,57 @@
 # Log4Qt Installation
 FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
 
-LABEL maintainer="Legatus Team"
-LABEL description="Log4Qt logging framework for Qt6"
+ARG RME_USERPASS=ctc
+ARG RME_ADMINSRV=10.198.80.75
+ARG RME_PROJECT=guez
+
+# Proxy configuration for air-gapped environments
+ARG http_proxy="http://10.198.80.130:3128"
+ARG no_proxy="localhost,127.0.0.1,defence-elec.de,.defence-elec.de,sl.defence-elec.de,10.198.80.0/23,192.168.133.0/24,141.200.0.0/16,10.184.0.0/15,10.199.101.35,10.199.101.36,10.199.101.158"
+ARG HTTP_PROXY=${http_proxy}
+ARG https_proxy=${http_proxy}
+ARG HTTPS_PROXY=${http_proxy}
+ARG NO_PROXY=${no_proxy}
+
+LABEL author="Legatus Team"
+LABEL project=${RME_PROJECT}
 LABEL version="2.0.0"
+LABEL description="Log4Qt logging framework for Qt6"
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+# OS and PATH configuration
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
 
-ENV http_proxy=${HTTP_PROXY}
-ENV https_proxy=${HTTPS_PROXY}
-ENV no_proxy=${NO_PROXY}
+# Shell global auf Bash mit sicheren Pipes umstellen
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Originale Repositories durch Nexus Proxies ersetzen
+RUN echo : > /etc/apt/sources.list && \
+    echo -e "Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu\n\
+Suites: resolute resolute-updates resolute-backports\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n\
+\n\
+Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu-security\n\
+Suites: resolute-security\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg" > /etc/apt/sources.list.d/ubuntu.sources
+
+# Create users (install openssl first for password hashing)
+RUN apt-get update && apt-get install -y openssl \
+    && groupadd ctc -g 1445 || true \
+    && groupadd rme -g 1001 || true \
+    && useradd -d /shd/CTC/TOOLS -u 1445 -g ctc -m -p $(openssl passwd -5 ${RME_USERPASS}) ctc || true \
+    && useradd -d /home/rme -u 1001 -g rme -m -p $(openssl passwd -5 ${RME_USERPASS}) rme || true \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL http://${RME_ADMINSRV}/rme/deb_and_rpm_signage_key.pub --output /etc/apt/keyrings/deb_and_rpm_signage_key.asc \
+    && curl -fsSL http://${RME_ADMINSRV}/rme/SL-Netz.crt --output /usr/local/share/ca-certificates/SL-Netz.crt \
+    && update-ca-certificates
 
 ARG QT_VERSION=6.10.2
 ARG LOG4QT_VERSION=2.0.0
diff --git a/external-dependencies/postgresql/Dockerfile b/external-dependencies/postgresql/Dockerfile
index 1eafa7ad9..d30cffef9 100644
--- a/external-dependencies/postgresql/Dockerfile
+++ b/external-dependencies/postgresql/Dockerfile
@@ -1,19 +1,57 @@
 # PostgreSQL Installation
 FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
 
-LABEL maintainer="Legatus Team"
-LABEL description="PostgreSQL client libraries"
+ARG RME_USERPASS=ctc
+ARG RME_ADMINSRV=10.198.80.75
+ARG RME_PROJECT=guez
+
+# Proxy configuration for air-gapped environments
+ARG http_proxy="http://10.198.80.130:3128"
+ARG no_proxy="localhost,127.0.0.1,defence-elec.de,.defence-elec.de,sl.defence-elec.de,10.198.80.0/23,192.168.133.0/24,141.200.0.0/16,10.184.0.0/15,10.199.101.35,10.199.101.36,10.199.101.158"
+ARG HTTP_PROXY=${http_proxy}
+ARG https_proxy=${http_proxy}
+ARG HTTPS_PROXY=${http_proxy}
+ARG NO_PROXY=${no_proxy}
+
+LABEL author="Legatus Team"
+LABEL project=${RME_PROJECT}
 LABEL version="16"
+LABEL description="PostgreSQL client libraries"
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-ARG HTTP_PROXY=""
-ARG HTTPS_PROXY=""
-ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+# OS and PATH configuration
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
 
-ENV http_proxy=${HTTP_PROXY}
-ENV https_proxy=${HTTPS_PROXY}
-ENV no_proxy=${NO_PROXY}
+# Shell global auf Bash mit sicheren Pipes umstellen
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Originale Repositories durch Nexus Proxies ersetzen
+RUN echo : > /etc/apt/sources.list && \
+    echo -e "Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu\n\
+Suites: resolute resolute-updates resolute-backports\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n\
+\n\
+Types: deb\n\
+URIs: http://remote-repo.sl.defence-elec.de:8081/repository/ubuntu-security\n\
+Suites: resolute-security\n\
+Components: main restricted universe multiverse\n\
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg" > /etc/apt/sources.list.d/ubuntu.sources
+
+# Create users (install openssl first for password hashing)
+RUN apt-get update && apt-get install -y openssl \
+    && groupadd ctc -g 1445 || true \
+    && groupadd rme -g 1001 || true \
+    && useradd -d /shd/CTC/TOOLS -u 1445 -g ctc -m -p $(openssl passwd -5 ${RME_USERPASS}) ctc || true \
+    && useradd -d /home/rme -u 1001 -g rme -m -p $(openssl passwd -5 ${RME_USERPASS}) rme || true \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL http://${RME_ADMINSRV}/rme/deb_and_rpm_signage_key.pub --output /etc/apt/keyrings/deb_and_rpm_signage_key.asc \
+    && curl -fsSL http://${RME_ADMINSRV}/rme/SL-Netz.crt --output /usr/local/share/ca-certificates/SL-Netz.crt \
+    && update-ca-certificates
 
 # Install PostgreSQL client libraries
 RUN apt-get update && apt-get install -y --no-install-recommends \