--- a/hgext/robustcheckout/__init__.py
+++ b/hgext/robustcheckout/__init__.py
@@ -12,27 +12,29 @@ times and storage efficiency.
 from __future__ import absolute_import
 
 import contextlib
 import errno
 import functools
 import os
 import random
 import re
+import socket
 import time
 
 from mercurial.i18n import _
 from mercurial.node import hex
 from mercurial import (
     commands,
     error,
     exchange,
     extensions,
     cmdutil,
     hg,
+    pycompat,
     scmutil,
     util,
 )
 
 testedwith = '3.8 3.9 4.0 4.1'
 minimumhgversion = '3.8'
 
 cmdtable = {}
@@ -260,16 +262,21 @@ def _docheckout(ui, url, dest, upstream,
                 ui.warn('(repository is unrelated; deleting)\n')
                 destvfs.rmtree(forcibly=True)
                 return True
             elif e.args[0].startswith(_('stream ended unexpectedly')):
                 ui.warn('%s\n' % e.args[0])
                 # Will raise if failure limit reached.
                 handlenetworkfailure()
                 return True
+        elif isinstance(e, pycompat.urlerr.urlerror):
+            if isinstance(e.reason, socket.error):
+                ui.warn('socket error: %s\n' % e.reason)
+                handlenetworkfailure()
+                return True
 
         return False
 
     created = False
 
     if not destvfs.exists():
         # Ensure parent directories of destination exist.
         # Mercurial 3.8 removed ensuredirs and made makedirs race safe.
@@ -283,17 +290,17 @@ def _docheckout(ui, url, dest, upstream,
 
         if upstream:
             ui.write('(cloning from upstream repo %s)\n' % upstream)
         cloneurl = upstream or url
 
         try:
             res = hg.clone(ui, {}, cloneurl, dest=dest, update=False,
                            shareopts={'pool': sharebase, 'mode': 'identity'})
-        except error.Abort as e:
+        except (error.Abort, pycompat.urlerr.urlerror) as e:
             if handlepullerror(e):
                 return callself()
             raise
         except error.RepoError as e:
             return handlerepoerror(e)
         except error.RevlogError as e:
             ui.warn('(repo corruption: %s; deleting shared store)\n' % e.message)
             deletesharedstore()
@@ -342,17 +349,17 @@ def _docheckout(ui, url, dest, upstream,
                         (branch, checkoutrevision))
 
             if checkoutrevision in repo:
                 ui.warn('(revision already present locally; not pulling)\n')
             else:
                 pullop = exchange.pull(repo, remote, heads=pullrevs)
                 if not pullop.rheads:
                     raise error.Abort('unable to pull requested revision')
-        except error.Abort as e:
+        except (error.Abort, pycompat.urlerr.urlerror) as e:
             if handlepullerror(e):
                 return callself()
             raise
         except error.RepoError as e:
             return handlerepoerror(e)
         except error.RevlogError as e:
             ui.warn('(repo corruption: %s; deleting shared store)\n' % e.message)
             deletesharedstore()

--- a/hgext/robustcheckout/tests/test-server-failure.t
+++ b/hgext/robustcheckout/tests/test-server-failure.t
@@ -12,19 +12,25 @@ Extension works with default config
   added 2 changesets with 2 changes to 1 files
   searching for changes
   no changes found
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   updated to 94086d65796fd7fc8f957a2c5548db17a13f1f1f
 
 Connecting to non-running server fails
 
-  $ hg robustcheckout http://localhost:$HGPORT1/repo0 no-server --revision 94086d65796f
+  $ hg robustcheckout http://localhost:$HGPORT1/repo0 no-server --revision 94086d65796f --networkattempts 2
   ensuring http://localhost:$HGPORT1/repo0@94086d65796f is available at no-server
-  abort: error: Connection refused
+  socket error: [Errno 111] Connection refused
+  (retrying after network failure on attempt 1 of 2)
+  (waiting *s before retry) (glob)
+  ensuring http://localhost:$HGPORT1/repo0@94086d65796f is available at no-server
+  socket error: [Errno 111] Connection refused
+  abort: reached maximum number of network attempts; giving up
+  
   [255]
 
 Server abort part way through response results in retries
 
   $ cp -a server/bad-server server/bad-server-bytelimit
 
   $ cat >> server/bad-server-bytelimit/.hg/hgrc << EOF
   > [badserver]