Dear all, I get the following error while running LAMMPS on ubuntu *without an internet connection.* *Invalid error code (-2) (error ring index 127 invalid)Invalid error code (-2) (error ring index 127 invalid)INTERNAL ERROR: invalid error code fffffffe (Ring Index out of range) in MPID_nem_tcp_init:373Fatal error in PMPI_Init: Other MPI error, error stack:MPIR_Init_thread(586)..............: MPID_Init(224).....................: channel initialization failedMPIDI_CH3_Init(105)................: MPID_nem_init(324).................: MPID_nem_tcp_init(175).............: MPID_nem_tcp_get_business_card(401): MPID_nem_tcp_init(373).............: gethostbyname failed, hirakjyoti-HP-dx2480-MT-KL969AV (errno 0)* But if the PC is connected to internet LAMMPS successfully run. How can i solve the problem? Regards, Hirak