ABB NETA-21 Setup Instructions page 65

Error code
502 Proxy Error. The
HTTP message
includes an
unsupported header
or an unsupported
combination of
headers.
503 Service
Unavailable
504 Gateway
Timeout
505 HTTP Version
Not Supported
511 Network
Authentication
Required
Root cause
Older version of ISA Server cannot read
the request HTTP headers from NETA-
21.
Digital service Servers are down
Same as above 1 and 2 (502 bad gate-
way ROOT CAUSE)
3. Digital service server is down
Customer network proxy is outdated
NETA-21 needs to authenticate to gain
network access. Intended for use by
intercepting proxies used to control
access to the network. For some net-
work connections, It used to require
agreement to Terms of Service before
granting full Internet access via a Wi-Fi
hotspot Ethernet adapter.
Installation troubleshooting (optional) 65
Solution
Contact customers Network/System
administrator to bypass NETA-21 IP
communication to destination digital
services server IPs.
Contact digital services administrator. If
server is up and not resolved, Make
sure that the customers Proxy configu-
ration is correct in NETA-21 and firewall
is not blocking the communication.
Ping digital service servers from cus-
tomer network. If Ping is not OK Con-
tact digital service administrator to
make sure if Server down.
Other resolutions are same as above
1,2,3(502 bad gateway Resolutions)
Contact customer's Network / System
administrator to bypass the proxy. If
Bypass is not possible, use an External
connection.
N/A (Not tested)