Unable to ssh from any wireless IP to another wireless IP on home network

Posting this as an answer as there's been no reply to my last comment, and it may help the OP or others in future...

There is a firmware issue - I'm not sure how widespread - that can cause some functionality to fail on this model of router after a certain date, referenced in this forum post.

The method to fix it as described in the post is to:

• disconnect the WAN from the router (ensuring you have all the settings you require noted down first)
• perform a hard reset
• disable the automatic updating of the date and time, and leave it at default (in the case of the original post, this was in 2007)
• reconnect the WAN

Simply adjusting the time/date may work, but not having access to this piece of kit I have no idea.

It sounds like there is Wireless Isolation enabled on the router somewhere by default. This prevents wireless clients from communicating with one another and only allows them to communicate with the base station. I have seen some posts online regarding this being a feature in the interface that can be turned off. It is possible that you may need to update the device firmware with a newer version to enable this. It may also be located somewhere in the Advanced panel you showed in the screen shots (Configuration File, System Settings, Port Configuration all seem likely candidates, Network Objects and Routing seem next likely candidates).