Please verify/check your IP-address, subnet mask and default gateway.
Then logon through a serial cable in SYSTERMINAL (Upper port on e.g. NIU) to check these settings:
IODDP should say IN SERVICE:
<IODDP;
I/O DEVICE DATA
NODE IODEV/SUBFS BPOS/EQU I/O-BUS TYPE/USAGE STATUS AUTH
SYSN - 001-0-60 - - IN SERVICE
SYSN SYSDISK1 001-0-60-0 SCSI/3 ADTX IN SERVICE
SYSSUBFS11
SYSSUBFS21
TM-SUBFS
SYSN SYSTERMINAL 001-0-60-1 - MML - 7
SYSN SYSTERMINAL1 001-0-60-2 - MML - 7
SYSN SYSTERMINAL2 001-0-60-3 - MML - 7
SYSN SYSNET 001-0-60-4 - NETWORK/OUT IN SERVICE
SYSN TELNETMML0 001-0-60-4 - NETWORK/MML - 7
IONPP;
Shold show correct LAN configuration.
Otherwise:
Try to restart some programs.
TWP3, NIP and FIP and maybe the NIU board.
BR doktor