PCH A-110 does not connect via WN-100 dongle (in N mode)

[sisuntas]

Hi,

I have PCH A-110. It is connected to my home network with original Wi-Fi "N" dongle WN-100 (via rear A-110 USB connector).

Recently I changed my "G" wi-fi router (D-Link DI-524) to a new "N" router (TP-Link TL-WR841N).

When my new router is set to "Mixed b/g/n" mode (WPA2) then I cannot access my PCH A-110 from my laptop or Android phone neither via FTP nor Samba nor Transmission. Though PCH A-110 shows as connected to router via Wi-Fi when router is in "Mixed b/g/n" mode and I can ping it from my laptop.

Following servers are running on my PCH A-110:
Samba, FTP, Torrent.

As soon as I switch my TP-Link router to "Mixed b/g" or "G only" mode I can access my PCH A-110 via FTP, Samba and Transmission. All works like a charm.

What could be wrong?
I understand that WN-100 is "N" adapter so it must work with my new N-router.

I also tried "Mixed b/g/n" mode without any security but still in vain.

Thanks!