Yesterday morning the main server had an overheat problem, so it went down.
So, we called the hosting and they had to perform an hardware check that took the whole day. At the end they repaired the cooler and in the meantime we rented a new server, now we're moving things and in a few day hikr will run on a new server.
When we will switch to the new server, hikr will go down again for a moment.
This morning there were some spam messages in the forum, but this is not related with the interruption of yesterday.