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Asked: 2026-05-10T20:33:25+00:00

Port was filtered by ISP. The problem is that HTTPS 443 port isn’t accessible

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Port was filtered by ISP.

The problem is that HTTPS 443 port isn’t accessible from internet, but it is open in our local network. Our iSeries v5r4 is connected to inet via L2TP withot IPSec. If no packet filters are active, nmap shows that ports 25, 80, 110 and even 10322 (WAS admin console) have state ‘open’ on internet IP address. 443 have state ‘filtered’.

If I activate the following packet rules:

# ----------------------------------------------- # Statements to permit inbound HTTP over STATICIP # ----------------------------------------------- INCLUDE   FILE = /QIBM/UserData/OS400/TCPIP/PacketRules/Services.i3p FILTER SET HTTP_INBOUND   ACTION = PERMIT   DIRECTION = OUTBOUND   SRCADDR = *   DSTADDR = *   SERVICE = HTTP_80_FS   JRN = OFF FILTER SET HTTP_INBOUND   ACTION = PERMIT   DIRECTION = INBOUND   SRCADDR = *   DSTADDR = *   SERVICE = HTTP_80_FC   JRN = OFF FILTER SET HTTP_INBOUND   ACTION = PERMIT   DIRECTION = OUTBOUND   SRCADDR = *   DSTADDR = *   SERVICE = HTTP_443_FS   JRN = OFF FILTER SET HTTP_INBOUND   ACTION = PERMIT   DIRECTION = INBOUND   SRCADDR = *   DSTADDR = *   SERVICE = HTTP_443_FC   JRN = OFF FILTER_INTERFACE   INTERFACE = STATICIP   SET = HTTP_INBOUND # -----------------------------------------------

port 80 is ‘open’, 443 is ‘filtered’.

How can I make it ‘open’?

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1 Answer

  1. Some ISPs filter specific ports, like RoadRunner used to filter my webserver. It’d be odd since 80 isn’t filtered, but it’s a possibility.

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