diff --git a/src/providers/DocumentContentProvider.ts b/src/providers/DocumentContentProvider.ts
index 07910d30..7c963f59 100644
--- a/src/providers/DocumentContentProvider.ts
+++ b/src/providers/DocumentContentProvider.ts
@@ -8,17 +8,30 @@ import { config, FILESYSTEM_SCHEMA, FILESYSTEM_READONLY_SCHEMA, OBJECTSCRIPT_FIL
 import { currentWorkspaceFolder, uriOfWorkspaceFolder } from "../utils";
 
 export function compareConns(
-  conn1: { ns: any; server: any; host: any; port: any },
-  conn2: { ns: any; server: any; host: any; port: any }
+  conn1: { ns: any; server: any; host: any; port: any; "docker-compose": any },
+  conn2: { ns: any; server: any; host: any; port: any; "docker-compose": any }
 ): boolean {
   if (conn1.ns === conn2.ns) {
+    // Same namespace name
     if (conn1.server && conn2.server) {
+      // Both connections name an entry in intersystems.servers
       if (conn1.server === conn2.server) {
         return true;
       }
     } else if (!conn1.server && !conn2.server) {
-      if (conn1.host === conn2.host && conn1.port === conn2.port) {
-        return true;
+      if (conn1.port && conn2.port) {
+        // Both connections specify a target port
+        if (conn1.host === conn2.host && conn1.port === conn2.port) {
+          return true;
+        }
+      } else if (conn1["docker-compose"] && conn2["docker-compose"]) {
+        // Both connections specify a docker-compose object
+        if (conn1["docker-compose"].service === conn2["docker-compose"].service) {
+          // Assume that if the service names match then the connection is to the same place.
+          // This may not be true (e.g. if the same service name is used in folder-specific docker-compose files)
+          // but it's the best we can do here without more information.
+          return true;
+        }
       }
     }
   }
diff --git a/src/utils/index.ts b/src/utils/index.ts
index 77e9fa85..a308a827 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -473,12 +473,18 @@ export async function portFromDockerCompose(): Promise<{ port: number; docker: b
   const workspaceFolderPath = workspaceFolder.fsPath;
   const workspaceRootPath = vscode.workspace.workspaceFolders[0].uri.fsPath;
 
-  const cwd: string = await fileExists(vscode.Uri.file(path.join(workspaceFolderPath, file))).then((exists) => {
+  const cwd: string = await fileExists(vscode.Uri.file(path.join(workspaceFolderPath, file))).then(async (exists) => {
     if (exists) {
-      return workspaceRootPath;
-    } else {
-      throw new Error(`File '${file}' not found.`);
+      return workspaceFolderPath;
+    }
+    if (workspaceFolderPath !== workspaceRootPath) {
+      exists = await fileExists(vscode.Uri.file(path.join(workspaceRootPath, file)));
+      if (exists) {
+        return workspaceRootPath;
+      }
+      throw new Error(`File '${file}' not found in ${workspaceFolderPath} or ${workspaceRootPath}.`);
     }
+    throw new Error(`File '${file}' not found in ${workspaceFolderPath}.`);
   });
 
   if (!cwd) {
@@ -494,7 +500,7 @@ export async function portFromDockerCompose(): Promise<{ port: number; docker: b
         reject(error.message);
       }
       if (!stdout.replaceAll("\r", "").split("\n").includes(service)) {
-        reject(`Service '${service}' not found in '${file}', or not running.`);
+        reject(`Service '${service}' not found in '${path.join(cwd, file)}', or not running.`);
       }
 
       exec(`${cmd} port --protocol=tcp ${service} ${internalPort}`, { cwd }, (error, stdout) => {
@@ -503,7 +509,7 @@ export async function portFromDockerCompose(): Promise<{ port: number; docker: b
         }
         const [, port] = stdout.match(/:(\d+)/) || [];
         if (!port) {
-          reject(`Port ${internalPort} not published for service '${service}'.`);
+          reject(`Port ${internalPort} not published for service '${service}' in '${path.join(cwd, file)}'.`);
         }
         resolve({ port: parseInt(port, 10), docker: true, service });
       });