diff --git a/xCAT-server/lib/xcat/plugins/debian.pm b/xCAT-server/lib/xcat/plugins/debian.pm
index a4ac3a6ef..d7cd438d6 100644
--- a/xCAT-server/lib/xcat/plugins/debian.pm
+++ b/xCAT-server/lib/xcat/plugins/debian.pm
@@ -1032,7 +1032,15 @@ sub mkinstall {
             my $kcmdline = "nofb utf8 auto xcatd=" . $instserver;
 
             if (using_subiquity($os,$tmplfile)) {
-                my $nfsip = xCAT::NetworkUtils->getipaddr($instserver) || $instserver;
+                # Fail here rather than handing casper a name: klibc's nfsmount cannot resolve
+                # one, so the node would panic "can't parse IP address" at boot, on the node,
+                # with nothing said on the management node.
+                my $nfsip = xCAT::NetworkUtils->getipaddr($instserver);
+                unless ($nfsip) {
+                    xCAT::MsgUtils->report_node_error($callback, $node,
+                        "Could not resolve the install server '$instserver' to an address. The Ubuntu live installer mounts its root with klibc nfsmount, which cannot resolve names, so nfsroot must be an address.");
+                    next;
+                }
                 $kcmdline = subiquity_kcmdline($kcmdline, $nfsip, $pkgdir, $instserver, $httpport, $node);
             } else {
                 $kcmdline .= " url=http://${instserver}:$httpport/install/autoinst/$node";
diff --git a/xCAT-server/share/xcat/install/ubuntu/compute.subiquity.tmpl b/xCAT-server/share/xcat/install/ubuntu/compute.subiquity.tmpl
index f82aec459..4ec7faf20 100644
--- a/xCAT-server/share/xcat/install/ubuntu/compute.subiquity.tmpl
+++ b/xCAT-server/share/xcat/install/ubuntu/compute.subiquity.tmpl
@@ -110,7 +110,9 @@ autoinstall:
     # Flip the node to local-disk boot, or it PXE-loops back into the installer on reboot.
     # "next" is the request xcatd's install monitor answers with "nodeset <node> next". Send it
     # from the live installer, retried, and log a failure rather than silently reinstalling. A
-    # monitor that died and never came back is a separate problem; see #7759.
-    - ['bash', '-c', 'xm=#XCATVAR:XCATMASTER#; ok=0; for i in 1 2 3 4 5; do if exec 3<>/dev/tcp/$xm/3002; then read -r r <&3 || true; printf "next\n" >&3; if read -r r <&3; then ok=1; fi; exec 3>&- 3<&-; [ "$ok" = 1 ] && break; fi; sleep 5; done; if [ "$ok" != 1 ]; then echo "xcat: FAILED to flip $(hostname) to local-disk boot via $xm:3002; the node will PXE back into the installer" >>/target/var/log/xcat/xcat.log; fi; exit 0']
+    # monitor that died and never came back is a separate problem; see #7759 -- but one that
+    # accepts the connection and then never answers would block a bare read forever and hang the
+    # install here, so both reads are bounded.
+    - ['bash', '-c', 'xm=#XCATVAR:XCATMASTER#; ok=0; for i in 1 2 3 4 5; do if exec 3<>/dev/tcp/$xm/3002; then read -r -t 10 r <&3 || true; printf "next\n" >&3; if read -r -t 10 r <&3; then ok=1; fi; exec 3>&- 3<&-; [ "$ok" = 1 ] && break; fi; sleep 5; done; if [ "$ok" != 1 ]; then echo "xcat: FAILED to flip $(hostname) to local-disk boot via $xm:3002; the node will PXE back into the installer" >>/target/var/log/xcat/xcat.log; fi; exit 0']
   error-commands:
     - tar -c --ignore-failed-read --transform='s/^/#HOSTNAME#-logs\//' /var/crash /var/log/installer /tmp/pre-install.log /autoinstall.yaml 2>/dev/null |nc -l 8080
diff --git a/xCAT-test/unit/ubuntu_subiquity_boot_flip.t b/xCAT-test/unit/ubuntu_subiquity_boot_flip.t
index a916de89f..8102718d0 100644
--- a/xCAT-test/unit/ubuntu_subiquity_boot_flip.t
+++ b/xCAT-test/unit/ubuntu_subiquity_boot_flip.t
@@ -61,6 +61,7 @@ sub run_flip {
             for (1 .. $opt{listen}) {
                 my $c = $srv->accept() or last;
                 $c->autoflush(1);
+                if ($opt{mute}) { sleep 600; close $c; next }  # accept and hold, never answer
                 print {$c} "ready\n";
                 my $line = <$c>;
                 print {$seen} $line if defined $line;
@@ -75,7 +76,8 @@ sub run_flip {
 
     # The installer would hang here if the exchange ever blocked, so bound it.
     # the no-listener case prints "Connection refused" by design
-    my $rc = system("timeout 25 bash -c \Q$script\E 2>/dev/null");
+    my $cap = $opt{cap} || 25;
+    my $rc = system("timeout $cap bash -c \Q$script\E 2>/dev/null");
     my $timed_out = (($rc >> 8) == 124);
     if ($pid) { kill 'TERM', $pid; waitpid($pid, 0) }
 
@@ -114,6 +116,18 @@ sub run_flip {
         'a connection without an acknowledgement counts as a failure, not a success');
 }
 
+# --- a monitor that accepts and never answers must not hang the install ----
+# The late-command runs inside Subiquity: a bare read on a socket that is open but silent blocks
+# forever and the install never finishes. #7759 fixes the monitor dying; this bounds the wait.
+{
+    # Five attempts, each bounded by two 10s reads plus the retry pause: ~2 minutes worst case.
+    my $r = run_flip(listen => 1, mute => 1, cap => 200);
+    ok(!$r->{timed_out},
+        'a monitor that accepts but never replies does not hang the late-command');
+    like($r->{log}, qr/FAILED to flip/,
+        'it is recorded as a failed flip rather than waiting indefinitely');
+}
+
 # --- the command retries rather than giving up on the first refusal --------
 {
     # Answer only on a later connection: the flip must still succeed.