diff --git a/.dockerignore b/.dockerignore
index 39979854..c7eca478 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,8 +1,2 @@
-build/
-dist/
-notebooks*/
-*/node_modules/
-*.egg-info/
-.eggs/
-*.pyc
-.git/
+*
+!Pipfile*
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bfb8114e..25c77ec2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -52,9 +52,15 @@ jobs:
     - run: make install
     - run: make lint
     - run: make test
-    # - run: make image${{ matrix.python-version }}
-    # - run: make -C selenium build
-    # - run: make test-selenium
+    - if: false
+      name: currently busted selenium test stuff
+      run: >
+        make image${{ matrix.python-version }}
+        make -C selenium build
+        make -C selenium clean
+        make -C selenium test-env-up
+        make -C selenium jupyter-up
+        make -C selenium test
   distributions:
     needs: test
     runs-on: ubuntu-latest
diff --git a/Dockerfile b/Dockerfile
index 72bd8faa..29b8870c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,18 +5,30 @@ LABEL maintainer="RStudio Connect <rsconnect@rstudio.com>"
 ARG NB_UID
 ARG NB_GID
 ARG PY_VERSION
-RUN apt-get update -qq \
-    && apt-get install -y make
+RUN apt-get update -qq && \
+    apt-get install -y make curl xz-utils git && \
+    curl -fsSL "https://nodejs.org/dist/v12.18.1/node-v12.18.1-linux-x64.tar.xz" | \
+      tar --strip-components=1 -C /usr/local -xJf - && \
+    npm install -g yarn
+
 RUN getent group ${NB_GID} || groupadd -g ${NB_GID} builder
 RUN useradd --password password \
     --create-home \
     --home-dir /home/builder \
     --uid ${NB_UID} \
     --gid ${NB_GID} \
-    builder
-
-RUN conda update conda
+    builder && \
+    mkdir -p /rsconnect_jupyter && \
+    chown ${NB_UID}:${NB_GID} /rsconnect_jupyter
 
 USER ${NB_UID}:${NB_GID}
-RUN bash -c 'cd /home/builder \
-    && conda create --yes --channel conda-forge --name py${PY_VERSION/./} python=${PY_VERSION} jupyter numpy matplotlib setuptools pip pipenv'
+WORKDIR /rsconnect_jupyter
+ENV WORKON_HOME=/home/builder \
+    PIPENV_DONT_LOAD_ENV=1 \
+    PIPENV_SHELL=/bin/bash \
+    PATH=/home/builder/.local/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+COPY Pipfile Pipfile
+COPY Pipfile.lock Pipfile.lock
+RUN python -m pip install -I -U pip pipenv && \
+    pipenv install --dev --python=/usr/local/bin/python && \
+    rm -vf Pipfile*
diff --git a/Makefile b/Makefile
index ab4bc71d..b9cc600c 100644
--- a/Makefile
+++ b/Makefile
@@ -22,28 +22,12 @@ image%:
 	docker build \
 		--tag $(IMAGE)$* \
 		--file Dockerfile \
-		--build-arg BASE_IMAGE=continuumio/miniconda:4.4.10 \
+		--build-arg BASE_IMAGE=python:$*-slim \
 		--build-arg NB_UID=$(NB_UID) \
 		--build-arg NB_GID=$(NB_GID) \
 		--build-arg PY_VERSION=$* \
 		.
 
-.PHONY: launch
-launch:
-	docker run --rm -i -t \
-		-v $(CURDIR)/notebooks$(PY_VERSION):/notebooks \
-		-v $(CURDIR):/rsconnect_jupyter \
-		-e NB_UID=$(NB_UID) \
-		-e NB_GID=$(NB_GID) \
-		-e PY_VERSION=$(PY_VERSION) \
-		-p :$(PORT):9999 \
-		$(DOCKER_IMAGE) \
-		/rsconnect_jupyter/run.sh $(TARGET)
-
-
-notebook%:
-	make DOCKER_IMAGE=$(IMAGE)$* PY_VERSION=$* TARGET=run launch
-
 .PHONY: all-tests
 all-tests: test2.7 test3.5 test3.6 test3.7 test3.8
 
@@ -51,9 +35,6 @@ all-tests: test2.7 test3.5 test3.6 test3.7 test3.8
 test: version-frontend
 	pipenv run pytest -vv --cov=rsconnect_jupyter tests/
 
-test%: version-frontend
-	make DOCKER_IMAGE=rstudio/rsconnect-jupyter-py$* PY_VERSION=$* TARGET=test launch
-
 .PHONY: test-selenium
 test-selenium:
 	$(MAKE) -C selenium clean test-env-up jupyter-up test || EXITCODE=$$? ; \
@@ -79,6 +60,7 @@ run: install
 .PHONY: install
 install: yarn
 	pipenv install --dev
+	$(MAKE) version-frontend
 	pipenv run pip install -e .
 	pipenv run jupyter-nbextension install --symlink --user --py rsconnect_jupyter
 	pipenv run jupyter-nbextension enable --py rsconnect_jupyter
diff --git a/mock_connect.py b/mock_connect.py
index 41ed19b7..d95b2f1c 100644
--- a/mock_connect.py
+++ b/mock_connect.py
@@ -17,7 +17,16 @@
 from pprint import pprint
 
 # noinspection PyPackageRequirements
-from flask import Flask, Blueprint, abort, after_this_request, g, request, url_for, jsonify
+from flask import (
+    Flask,
+    Blueprint,
+    abort,
+    after_this_request,
+    g,
+    request,
+    url_for,
+    jsonify,
+)
 
 
 def error(code, reason):
@@ -307,8 +316,7 @@ def get_task(task):
 @api.route("server_settings")
 @json
 def server_settings():
-    # for our purposes, any non-error response will do
-    return {}
+    return {"not_empty": True}
 
 
 # noinspection PyUnresolvedReferences
diff --git a/rsconnect_jupyter/__init__.py b/rsconnect_jupyter/__init__.py
index c82a6856..3e0d3e52 100644
--- a/rsconnect_jupyter/__init__.py
+++ b/rsconnect_jupyter/__init__.py
@@ -74,6 +74,15 @@ def post(self, action):
             disable_tls_check = data["disable_tls_check"]
             cadata = data.get("cadata", None)
 
+            self.log.warning(
+                "server_address=%r api_key=%r disable_tls_check=%r cadata=%r",
+                server_address,
+                api_key,
+                disable_tls_check,
+                cadata,
+            )
+            canonical_address = None
+            result = None
             try:
                 canonical_address, result = test_server(
                     RSConnectServer(server_address, api_key, disable_tls_check, cadata)
@@ -96,6 +105,8 @@ def post(self, action):
                     + u'  upload it using "Upload TLS Certificate Bundle" below.',
                 )
             except Exception as err:
+                self.log.exception("Unable to verify that the provided server is running RStudio Connect")
+                self.log.warning("canonical_address=%r result=%r", canonical_address, result)
                 raise web.HTTPError(
                     400, u"Unable to verify that the provided server is running RStudio Connect: %s" % err,
                 )
diff --git a/selenium/Makefile b/selenium/Makefile
index fc9ea7cf..d1216002 100644
--- a/selenium/Makefile
+++ b/selenium/Makefile
@@ -34,7 +34,7 @@ SCALE_FIREFOX=${SCALE}
 SCALE_CHROME=${SCALE}
 SELENIUM_VERSION=3.8.1-dubnium
 TMP_PIPE=tmp.pipe
-TRE_IMAGE?=rstudio/checkrs-tew:0.1.0
+TRE_IMAGE?=rstudio/checkrs-tew:0.3.2
 
 # Allocate a tty and keep stdin open when running locally
 # Jenkins nodes don't have input tty, so we set this to ""
@@ -46,7 +46,7 @@ DOCKER_RUN_COMMAND=docker run --rm --init \
 	    --network=$(NETWORK) \
 	    --volume=$(CURDIR)/..:${RSCONNECT_DIR} \
 	    --volume=$(CURDIR)/../notebooks$(PY_VERSION):${NOTEBOOKS_DIR} \
-	    --user=`id -u`:`id -g` \
+			--user=$(NB_UID):$(NB_GID) \
 	    --workdir=${RSCONNECT_DIR}/selenium \
 	    ${TRE_IMAGE}
 
@@ -82,8 +82,8 @@ build-mock-connect:
 	docker build -t ${CONNECT_IMAGE} ${CONNECT_DOCKERFILE_DIR}
 
 clean:
-	rm -f *.png *.log *.xml ${TMP_PIPE};
-	rm -rf .pytest_cache;
+	rm -f *.png *.log *.xml ${TMP_PIPE}
+	rm -rf .pytest_cache
 
 distclean: clean
 
@@ -123,7 +123,7 @@ wait-for-systems-up:
 	    --name=systemstat \
 	    --network=$(NETWORK) \
 	    --volume=${CURDIR}/..:${RSCONNECT_DIR} \
-	    --user=`id -u`:`id -g` \
+			--user=$(NB_UID):$(NB_GID) \
 	    --workdir=${RSCONNECT_DIR}/selenium \
 	    ${TRE_IMAGE} \
 	    ./wait_for_systems_up.sh \
@@ -156,7 +156,7 @@ network-up:
 	@if [ "${NETWORK_EXISTS}" = "1" ] ; then \
 	    echo "Creating network: ${NETWORK}"; \
 	    docker network create --driver bridge ${NETWORK} ; \
-	fi;
+	fi
 
 network-down: connect-down grid-down
 	$(eval NETWORK_EXISTS=$(shell docker network inspect ${NETWORK} > /dev/null 2>&1 && echo 0 || echo 1))
@@ -167,13 +167,10 @@ network-down: connect-down grid-down
 	    done; \
 	    echo "Removing network: ${NETWORK}"; \
 	    docker network rm ${NETWORK}; \
-	fi;
-
-# I think we need TINI_SUBREAPER set because we are using --init, but run.sh
-# calls a make command which launches another command.
+	fi
 
 jupyter-up:
-	@echo -n "Creating ${JUPYTER_HOST} ..."
+	@echo "Creating ${JUPYTER_HOST} ..."
 	@docker run --rm -d --init \
 	    ${DOCKER_TTY_FLAGS} \
 	    --name=${JUPYTER_HOST} \
@@ -187,7 +184,7 @@ jupyter-up:
 	    --publish=:${JUPYTER_PORT}:${JUPYTER_PORT} \
 	    --workdir=${RSCONNECT_DIR} \
 	    $(JUPYTER_IMAGE) \
-	    ${RSCONNECT_DIR}/run.sh run \
+	    make -C ${RSCONNECT_DIR} run \
 	    1>/dev/null
 	@docker logs -f ${JUPYTER_HOST} > ${JUPYTER_LOG} &
 	@echo " done"
@@ -195,13 +192,13 @@ jupyter-up:
 jupyter-down:
 	$(eval JUPYTER_EXISTS=$(shell docker container inspect ${JUPYTER_HOST} > /dev/null 2>&1 && echo 0 || echo 1))
 	@if [ "${JUPYTER_EXISTS}" = "0" ] ; then \
-	    echo -n "Stopping ${JUPYTER_HOST} ..."; \
+	    echo "Stopping ${JUPYTER_HOST} ..."; \
 	    docker stop ${JUPYTER_HOST} 1>/dev/null; \
 	    echo " done"; \
-	fi;
+	fi
 
 connect-up:
-	@echo -n "Creating ${CONNECT_HOST} ..."
+	@echo "Creating ${CONNECT_HOST} ..."
 	@docker run --rm -d --init \
 	    ${DOCKER_TTY_FLAGS} \
 	    --name=${CONNECT_HOST} \
@@ -219,10 +216,10 @@ connect-up:
 connect-down:
 	$(eval CONNECT_EXISTS=$(shell docker container inspect ${CONNECT_HOST} > /dev/null 2>&1 && echo 0 || echo 1))
 	@if [ "${CONNECT_EXISTS}" = "0" ] ; then \
-	    echo -n "Stopping ${CONNECT_HOST} ..."; \
+	    echo "Stopping ${CONNECT_HOST} ..."; \
 	    docker stop ${CONNECT_HOST} 1>/dev/null; \
 	    echo " done"; \
-	fi;
+	fi
 
 
 .PHONY: all