My Minecraft account has been unable to connect to servers for approximately one week now. Upon launching Minecraft for Windows from the launcher two error appear above the marketplace button before disappearing (attached below).

Then once logged in and going to Play>Servers and selecting any server after approximately 5 seconds the message "Unable to connect to the target server" appears. This has not effected joining worlds under the multiplayer tab.

Recently I added a custom skin pack which may be causing this, however I am pretty sure this issue existed before then, in case it is needed to reproduce it has also been attached.