diff --git a/burrow/src/database.rs b/burrow/src/database.rs
index e8119481..9a9aac3f 100644
--- a/burrow/src/database.rs
+++ b/burrow/src/database.rs
@@ -105,7 +105,7 @@ pub fn dump_interface(conn: &Connection, config: &Config) -> Result<()> {
         cif.private_key,
         to_lst(&cif.dns),
         to_lst(&cif.address),
-        cif.listen_port,
+        cif.listen_port.unwrap_or(51820),
         cif.mtu
     ])?;
     let interface_id = conn.last_insert_rowid();
diff --git a/burrow/src/wireguard/config.rs b/burrow/src/wireguard/config.rs
index 1d9315a0..5766675e 100644
--- a/burrow/src/wireguard/config.rs
+++ b/burrow/src/wireguard/config.rs
@@ -48,7 +48,7 @@ pub struct Peer {
 pub struct Interface {
     pub private_key: String,
     pub address: Vec<String>,
-    pub listen_port: u32,
+    pub listen_port: Option<u32>,
     pub dns: Vec<String>,
     pub mtu: Option<u32>,
 }
@@ -102,7 +102,7 @@ impl Default for Config {
             interface: Interface {
                 private_key: "OEPVdomeLTxTIBvv3TYsJRge0Hp9NMiY0sIrhT8OWG8=".into(),
                 address: vec!["10.13.13.2/24".into()],
-                listen_port: 51820,
+                listen_port: Some(51820),
                 dns: Default::default(),
                 mtu: Default::default(),
             },
@@ -118,11 +118,11 @@ impl Default for Config {
     }
 }
 
-fn props_get<T>(props: &Properties, key: &str) -> T
+fn props_get<T>(props: &Properties, key: &str) -> Result<T>
 where
-    T: From<IniField>,
+    T: TryFrom<IniField, Error = anyhow::Error>,
 {
-    IniField::from(props.get(key)).into()
+    IniField::try_from(props.get(key))?.try_into()
 }
 
 impl TryFrom<&Properties> for Interface {
@@ -130,11 +130,11 @@ impl TryFrom<&Properties> for Interface {
 
     fn try_from(props: &Properties) -> Result<Self, Error> {
         Ok(Self {
-            private_key: props_get(props, "PrivateKey"),
-            address: props_get(props, "Address"),
-            listen_port: props_get(props, "ListenPort"),
-            dns: props_get(props, "DNS"),
-            mtu: props_get(props, "MTU"),
+            private_key: props_get(props, "PrivateKey")?,
+            address: props_get(props, "Address")?,
+            listen_port: props_get(props, "ListenPort")?,
+            dns: props_get(props, "DNS")?,
+            mtu: props_get(props, "MTU")?,
         })
     }
 }
@@ -144,12 +144,12 @@ impl TryFrom<&Properties> for Peer {
 
     fn try_from(props: &Properties) -> Result<Self, Error> {
         Ok(Self {
-            public_key: props_get(props, "PublicKey"),
-            preshared_key: props_get(props, "PresharedKey"),
-            allowed_ips: props_get(props, "AllowedIPs"),
-            endpoint: props_get(props, "Endpoint"),
-            persistent_keepalive: props_get(props, "PersistentKeepalive"),
-            name: props_get(props, "Name"),
+            public_key: props_get(props, "PublicKey")?,
+            preshared_key: props_get(props, "PresharedKey")?,
+            allowed_ips: props_get(props, "AllowedIPs")?,
+            endpoint: props_get(props, "Endpoint")?,
+            persistent_keepalive: props_get(props, "PersistentKeepalive")?,
+            name: props_get(props, "Name")?,
         })
     }
 }
diff --git a/burrow/src/wireguard/inifield.rs b/burrow/src/wireguard/inifield.rs
index fb65a20b..946868de 100644
--- a/burrow/src/wireguard/inifield.rs
+++ b/burrow/src/wireguard/inifield.rs
@@ -1,54 +1,76 @@
 use std::str::FromStr;
 
+use anyhow::{Error, Result};
+
 pub struct IniField(String);
 
 impl FromStr for IniField {
-    type Err = anyhow::Error;
+    type Err = Error;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         Ok(Self(s.to_string()))
     }
 }
 
-impl From<IniField> for Vec<String> {
-    fn from(field: IniField) -> Self {
-        field.0.split(",").map(|s| s.to_string()).collect()
+impl TryFrom<IniField> for Vec<String> {
+    type Error = Error;
+
+    fn try_from(field: IniField) -> Result<Self, Self::Error> {
+        Ok(field.0.split(',').map(|s| s.trim().to_string()).collect())
     }
 }
 
-impl From<IniField> for u32 {
-    fn from(value: IniField) -> Self {
-        value.0.parse().unwrap()
+impl TryFrom<IniField> for u32 {
+    type Error = Error;
+
+    fn try_from(value: IniField) -> Result<Self, Self::Error> {
+        value.0.parse().map_err(Error::from)
     }
 }
 
-impl From<IniField> for Option<u32> {
-    fn from(value: IniField) -> Self {
-        Some(value.0.parse().unwrap())
+impl TryFrom<IniField> for Option<u32> {
+    type Error = Error;
+
+    fn try_from(value: IniField) -> Result<Self, Self::Error> {
+        if value.0.is_empty() {
+            Ok(None)
+        } else {
+            value.0.parse().map(Some).map_err(Error::from)
+        }
     }
 }
 
-impl From<IniField> for String {
-    fn from(value: IniField) -> Self {
-        value.0
+impl TryFrom<IniField> for String {
+    type Error = Error;
+
+    fn try_from(value: IniField) -> Result<Self, Self::Error> {
+        Ok(value.0)
     }
 }
 
-impl From<IniField> for Option<String> {
-    fn from(value: IniField) -> Self {
-        Some(value.0)
+impl TryFrom<IniField> for Option<String> {
+    type Error = Error;
+
+    fn try_from(value: IniField) -> Result<Self, Self::Error> {
+        if value.0.is_empty() {
+            Ok(None)
+        } else {
+            Ok(Some(value.0))
+        }
     }
 }
 
-impl<T> From<Option<T>> for IniField
+impl<T> TryFrom<Option<T>> for IniField
 where
     T: ToString,
 {
-    fn from(value: Option<T>) -> Self {
-        match value {
+    type Error = Error;
+
+    fn try_from(value: Option<T>) -> Result<Self, Self::Error> {
+        Ok(match value {
             Some(v) => Self(v.to_string()),
-            None => Self("".to_string()),
-        }
+            None => Self(String::new()),
+        })
     }
 }