diff --git a/vcsserver/remote/hg_remote.py b/vcsserver/remote/hg_remote.py
--- a/vcsserver/remote/hg_remote.py
+++ b/vcsserver/remote/hg_remote.py
@@ -86,7 +86,7 @@ from vcsserver.lib.exc_tracking import f
 log = logging.getLogger(__name__)
 
 
-def make_ui_from_config(repo_config):
+def make_ui_from_config(repo_config, interactive=True):
 
     class LoggingUI(ui.ui):
 
@@ -144,6 +144,7 @@ def make_ui_from_config(repo_config):
         log.debug('Explicitly disable largefiles extension for repo.')
         baseui.setconfig(b'extensions', b'largefiles', b'!')
 
+    baseui.setconfig(b'ui', b'interactive', b'true' if interactive else b'false')
     return baseui
 
 
@@ -523,7 +524,7 @@ class HgRemote(RemoteBase):
                 log.debug(
                     "Verifying if URL is a Mercurial repository: %s", obfuscated_uri)
                 # Create repo path with custom mercurial path object
-                ui = make_ui_from_config(config)
+                ui = make_ui_from_config(config, interactive=False)
                 repo_path = hg_path(ui=ui, rawloc=safe_bytes(url))
                 peer_checker = make_peer(ui, repo_path, False)
                 peer_checker.lookup(b'tip')
@@ -803,12 +804,12 @@ class HgRemote(RemoteBase):
         repo = self._factory.repo(wire)
 
         # Disable any prompts for this repo
-        repo.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
+        repo.ui.setconfig(b'ui', b'interactive', b'false', b'-y')
 
         bookmarks = list(dict(repo._bookmarks).keys())
         remote = peer(repo, {}, safe_bytes(url))
         # Disable any prompts for this remote
-        remote.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
+        remote.ui.setconfig(b'ui', b'interactive', b'false', b'-y')
 
         return exchange.push(
             repo, remote, newbranch=True, bookmarks=bookmarks).cgresult
@@ -1020,11 +1021,11 @@ class HgRemote(RemoteBase):
     def pull(self, wire, url, commit_ids=None):
         repo = self._factory.repo(wire)
         # Disable any prompts for this repo
-        repo.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
+        repo.ui.setconfig(b'ui', b'interactive', b'false', b'-y')
 
         remote = peer(repo, {}, safe_bytes(url))
         # Disable any prompts for this remote
-        remote.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
+        remote.ui.setconfig(b'ui', b'interactive', b'false', b'-y')
 
         if commit_ids:
             commit_ids = [bin(commit_id) for commit_id in commit_ids]
@@ -1103,7 +1104,7 @@ class HgRemote(RemoteBase):
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
-        repo.ui.setconfig(b'ui', b'interactive', False)
+        repo.ui.setconfig(b'ui', b'interactive', b'false')
         commands.merge(baseui, repo, rev=safe_bytes(revision))
 
     @reraise_safe_exceptions
@@ -1115,7 +1116,7 @@ class HgRemote(RemoteBase):
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
-        repo.ui.setconfig(b'ui', b'interactive', False)
+        repo.ui.setconfig(b'ui', b'interactive', b'false')
         ms = hg_merge.mergestate(repo)
         return [x for x in ms.unresolved()]
 
@@ -1136,7 +1137,7 @@ class HgRemote(RemoteBase):
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
-        repo.ui.setconfig(b'ui', b'interactive', False)
+        repo.ui.setconfig(b'ui', b'interactive', b'false')
 
         rebase_kws = dict(
             keep=not abort,