diff --git a/magic-nix-cache/src/api.rs b/magic-nix-cache/src/api.rs
index d31c921..db0435f 100644
--- a/magic-nix-cache/src/api.rs
+++ b/magic-nix-cache/src/api.rs
@@ -49,7 +49,6 @@ async fn workflow_finish(
     Extension(state): Extension<State>,
 ) -> Result<Json<WorkflowFinishResponse>> {
     tracing::info!("Workflow finished");
-
     let original_paths = state.original_paths.lock().await;
     let final_paths = get_store_paths(&state.store).await?;
     let new_paths = final_paths
@@ -66,7 +65,7 @@ async fn workflow_finish(
     if let Some(sender) = state.shutdown_sender.lock().await.take() {
         sender
             .send(())
-            .expect("Cannot send shutdown server message");
+            .map_err(|_| Error::Internal("Sending shutdown server message".to_owned()))?;
 
         // Wait for the Attic push workers to finish.
         if let Some(attic_state) = state.flakehub_state.write().await.take() {
diff --git a/magic-nix-cache/src/error.rs b/magic-nix-cache/src/error.rs
index 1318c12..314f428 100644
--- a/magic-nix-cache/src/error.rs
+++ b/magic-nix-cache/src/error.rs
@@ -51,6 +51,9 @@ pub enum Error {
 
     #[error("Configuration error: {0}")]
     Config(String),
+
+    #[error("Internal error: {0}")]
+    Internal(String),
 }
 
 impl IntoResponse for Error {
diff --git a/magic-nix-cache/src/flakehub.rs b/magic-nix-cache/src/flakehub.rs
index 454aac9..3f63796 100644
--- a/magic-nix-cache/src/flakehub.rs
+++ b/magic-nix-cache/src/flakehub.rs
@@ -39,7 +39,7 @@ pub async fn init_cache(
         netrc_rs::Netrc::parse(netrc_contents, false).map_err(Error::Netrc)?
     };
 
-    let netrc_entry = {
+    let flakehub_netrc_entry = {
         netrc
             .machines
             .iter()
@@ -55,17 +55,17 @@ pub async fn init_cache(
         .ok_or_else(|| Error::BadUrl(flakehub_cache_server.to_owned()))?
         .to_string();
 
-    let login = netrc_entry.login.as_ref().ok_or_else(|| {
+    let flakehub_login = flakehub_netrc_entry.login.as_ref().ok_or_else(|| {
         Error::Config(format!(
             "netrc file does not contain a login for '{}'",
-            flakehub_cache_server
+            flakehub_api_server
         ))
     })?;
 
-    let password = netrc_entry.password.as_ref().ok_or_else(|| {
+    let flakehub_password = flakehub_netrc_entry.password.as_ref().ok_or_else(|| {
         Error::Config(format!(
             "netrc file does not contain a password for '{}'",
-            flakehub_cache_server
+            flakehub_api_server
         ))
     })?;
 
@@ -83,8 +83,8 @@ pub async fn init_cache(
         netrc_file
             .write_all(
                 format!(
-                    "\nmachine {} password {}\n\n",
-                    flakehub_cache_server_hostname, password,
+                    "\nmachine {} login {} password {}\n\n",
+                    flakehub_cache_server_hostname, flakehub_login, flakehub_password,
                 )
                 .as_bytes(),
             )
@@ -104,7 +104,7 @@ pub async fn init_cache(
         let response = reqwest::Client::new()
             .get(url.to_owned())
             .header("User-Agent", USER_AGENT)
-            .basic_auth(login, Some(password))
+            .basic_auth(flakehub_login, Some(flakehub_password))
             .send()
             .await?;
 
@@ -135,7 +135,7 @@ pub async fn init_cache(
 
     let api = ApiClient::from_server_config(ServerConfig {
         endpoint: flakehub_cache_server.to_string(),
-        token: netrc_entry.password.as_ref().cloned(),
+        token: flakehub_netrc_entry.password.as_ref().cloned(),
     })?;
 
     let cache_config = api.get_cache_config(&cache).await?;
diff --git a/magic-nix-cache/src/main.rs b/magic-nix-cache/src/main.rs
index 4d59d57..623270f 100644
--- a/magic-nix-cache/src/main.rs
+++ b/magic-nix-cache/src/main.rs
@@ -328,12 +328,15 @@ async fn main_cli() -> Result<()> {
                     Err(anyhow!(
                         "Startup notification returned an error: {}\n{}",
                         response.status(),
-                        response.text().await.unwrap_or_else(|_| "<no response text>".to_owned())
+                        response
+                            .text()
+                            .await
+                            .unwrap_or_else(|_| "<no response text>".to_owned())
                     ))?;
                 }
             }
-            Err(err) => {
-                Err(anyhow!("Startup notification failed: {}", err))?;
+            err @ Err(_) => {
+                err.with_context(|| "Startup notification failed")?;
             }
         }
     }
@@ -386,7 +389,10 @@ async fn post_build_hook(out_paths: &str) -> Result<()> {
         Ok(response) if !response.status().is_success() => Err(anyhow!(
             "magic-nix-cache server failed to enqueue the push request: {}\n{}",
             response.status(),
-            response.text().await.unwrap_or_else(|_| "<no response text>".to_owned()),
+            response
+                .text()
+                .await
+                .unwrap_or_else(|_| "<no response text>".to_owned()),
         ))?,
         Ok(response) => response
             .json::<api::EnqueuePathsResponse>()