Firewall/NAT/1:1/Edit - wont accept internal IP address format?!?

[TechnoBob]

I have a few 1:1 NATs that I've been using for years.  I needed to add another.  I set up an unused WAN IP on the External subnet IP field.  I had my WAN interface selected.  For the Internal IP part I select Single Host and put in the internal IP address of the machine (as I have done many times).  This time it keeps telling me "Please match the requested format" (see attached snapshot).

BTW: I'm running 2.3.2-RELEASE (amd64)

[Derelict]

https://forum.pfsense.org/index.php?topic=113416.msg656239#msg656239

[NOYB]

Here's a more appropriate link.

https://forum.pfsense.org/index.php?action=search&advanced&search=Please match the requested format&sort=id_msg|desc;