Increase MaxConnections and MaxStartup

Dockerfile

@@ -98,6 +98,11 @@ COPY --from=builder /deps/dtcmp/lib/ /usr
 
 COPY --from=builder /mfu/ /usr
 
+# Configure the ssh server to allow 512 unsecured connections that occur before authentication is
+# completed.
+RUN sed -i "s/[ #]\(.*MaxSessions\).*/\1 512/g" /etc/ssh/sshd_config \
+    && sed -i "s/[ #]\(.*MaxStartups\).*/\1 512:0:512/g" /etc/ssh/sshd_config
+
 ###############################################################################
 # Pull in the debugging symbols on top of production image
 FROM production AS debug