I’ve been trying to checkout/update from repository at svn://svnmios.midibox.org/mios32 all day with “..host has failed to respond.”.
I think I crashed it yesterday evening.
It seems that Twin-X has installed a new firewall protection which is sensitive to the SVN port 3690
Whenever you are accessing SVN, your IP will be blocked for at least one hour.
I can reproduce this at my side as well… the server was still accessible from my mobile network.
I informed Twin-X about this issue, hopefully it will be possible to exclude the SVN port from this mechanism!
Best Regards, Thorsten.
Twin-X has modified the firewall configuration - SVN should work again! 
Best Regards, Thorsten.