Thanks for the tips although I currently don't understand the importance of the port number
If you have one of these modules behind a router (NAT) and another device is configured for PORT 80, say Apache for a web sever, you will not be able to serve web pages directly from the module because it only listens on PORT 80 and this can not be changed. Same if you have it set as a HTPPS server, PORT 443 is all it will listen to. This all is not a problem on a LAN.

The SERIAL NET function of these modules are not a problem, you can pick your port.
But then it is a Nano SocketLAN I want to buy not the Nano LANReach or am I wrong?
The Nano Socket family are the ones I use, they have pins. The on board antenna on the wifi module is pretty good too.

One more question about the NANO module; as I will use it to update a server's clock using NTP (or SNTP), will I need an external program running on the server to handle the time information provided by the module or is the module capable to do it all by itself?
I am not sure how to answer this one.
The module can be set to check certain time servers, it is a client.
From your other thread I think I know what you want to do. Have your own time server on a LAN that is not connected to a WAN?
If that is correct then I think it is doable...
Where ever you are getting your time from could be sent to the module with a PIC and the module FTP, SERIAL NET, email,,, the data to the server. Then the server has a script to deal with the data... Kind of like I do for temperature data??