diff --git a/src/errors.js b/src/errors.js
index 3e356f2..2940b14 100644
--- a/src/errors.js
+++ b/src/errors.js
@@ -8,6 +8,7 @@ var createError = require('errno').create
  *       |    +-- ChainRequestError
  *       |    +-- ConnectionTimeout
  *       |    +-- ElectrumJSError
+ *       |    +-- GetHeaderError
  *       |    +-- GetTxError
  *       |    +-- IdleTimeout
  *       |    +-- NotConnectedError
diff --git a/src/network/chain.js b/src/network/chain.js
index 5626924..5d2d3cd 100644
--- a/src/network/chain.js
+++ b/src/network/chain.js
@@ -90,6 +90,10 @@ Chain.prototype._doOpen = function () {
     return self.emit('error', new errors.NotImplementedError(errMsg))
   }
 
+  if (self.readyState !== self.CLOSED) {
+    return
+  }
+
   self._setReadyState(self.CONNECTING)
 
   self._autoReconnect = true
@@ -164,6 +168,10 @@ Chain.prototype._doOpen = function () {
  * @see {@link Network#_doClose}
  */
 Chain.prototype._doClose = function () {
+  if (this.readyState === this.CLOSING || this.readyState === this.CLOSED) {
+    return
+  }
+
   this._setReadyState(this.CLOSING)
 
   this._ws.onopen = null
@@ -198,7 +206,7 @@ Chain.prototype._updateIdleTimeout = function () {
   self._idleTimeout = setTimeout(function () {
     if (self.readyState === self.OPEN) {
       self._ws.close()
-      self.emit('error', new errors.IdleTimeout('Chain: WebSocket'))
+      self.emit('error', new errors.IdleTimeout('Chain: WebSocket timeout'))
     }
 
   }, 25000)
@@ -333,7 +341,8 @@ Chain.prototype.getHeader = function (height) {
       }
 
       if (response.height !== height) {
-        throw new errors.GetHeaderError()
+        var errMsg = 'Chain: requested - ' + height + ', got - ' + response.height
+        throw new errors.GetHeaderError(errMsg)
       }
 
       yatc.verify('ChainHeader', response)
diff --git a/src/network/electrumjs.js b/src/network/electrumjs.js
index a562e75..cac65a6 100644
--- a/src/network/electrumjs.js
+++ b/src/network/electrumjs.js
@@ -54,12 +54,12 @@ function ElectrumJS(opts) {
 
   self._socket.on('connect_error', function () {
     self._setReadyState(self.CLOSED)
-    self.emit('error', new errors.ConnectionTimeout('ElectrumJS'))
+    self.emit('error', new errors.ConnectionTimeout('ElectrumJS: connect_error'))
   })
 
   self._socket.on('connect_timeout', function () {
     self._setReadyState(self.CLOSED)
-    self.emit('error', new errors.ConnectionTimeout('ElectrumJS'))
+    self.emit('error', new errors.ConnectionTimeout('ElectrumJS: connect_timeout'))
   })
 
   self._socket.on('disconnect', function (reason) {
@@ -150,6 +150,10 @@ inherits(ElectrumJS, Network)
  * @see {@link Network#_doOpen}
  */
 ElectrumJS.prototype._doOpen = function () {
+  if (this.readyState !== this.CLOSED) {
+    return
+  }
+
   this._setReadyState(this.CONNECTING)
   this._socket.connect()
 }
@@ -160,6 +164,10 @@ ElectrumJS.prototype._doOpen = function () {
  * @see {@link Network#_doClose}
  */
 ElectrumJS.prototype._doClose = function () {
+  if (this.readyState === this.CLOSING || this.readyState === this.CLOSED) {
+    return
+  }
+
   this._setReadyState(this.CLOSING)
   this._socket.disconnect()
 }
@@ -248,7 +256,8 @@ ElectrumJS.prototype.getHeader = function (height) {
       }
 
       if (response.block_height !== height) {
-        throw new errors.GetHeaderError()
+        var errMsg = 'Chain: requested - ' + height + ', got - ' + response.block_height
+        throw new errors.GetHeaderError(errMsg)
       }
 
       yatc.verify('ElectrumHeader', response)