Anyone else having trouble Punchout to Grainger?

It worked at one point, but stopped. However, punchout to Staples works fine

Note:

1. Cannot ping successfully.
2. Added new certificates

Nodes>Connectors>Ping Node

Node Information

Integration Gateway ID Connector ID Connector URL Message Text

LOCAL

HTTPTARGET

Integration Gateway - External System Contact Error (158,10721)

Integration Gateway - External System Contact Error

-----------------------Trying to Punchout --------------------------------

WEBLIB_PV_DC.FUNCLIB.FieldFormula Name:DirectConnectMobile_2 PCPC:45219 Statement:578

Called from:PV_MOB_HOME_WRK.PV_LINK1.FieldFormula Name:TriggerPunchout Statement:106

Called from:PV_MOB_SRCH_WRK.PV_LINK1.FieldChange Statement:15

Integration Gateway was not able to contact the external system. The network location specified may be incorrect, or the site is permanently or temporarily down.