ABB NETA-21 Setup Instructions page 66

66 Installation troubleshooting (optional)
Error code
598 Network read
time out error
599 Network connect
time out error
520 Origin Error
522 Connection
timed out
523 Proxy Declined
Request
524 A time out
occurred
Root cause
This status code is not specified in any
RFCs, but is used by Microsoft HTTP
proxies to signal a network read timeout
behind the proxy to a client (NETA-21)
in front of the proxy.
This status code is not specified in any
RFCs, but is used by Microsoft HTTP
proxies to signal a network connect tim-
eout behind the proxy to a client (NETA-
21) in front of the proxy
This status code is not specified in any
RFCs, but is used by Cloudflare's
reverse proxies to signal an "unknown
connection issue between Cloud Flare
and the origin web server" to a client in
front of the proxy. So customer who has
Cloudflare proxy for their network get
this error
This status code is not specified in any
RFCs, but is used by Cloudflare's
reverse proxies to signal that a server
connection timed out
This status code is not specified in any
RFCs, but is used by Cloudflare's
reverse proxies to signal a resource
that has been blocked by the adminis-
trator
This status code is not specified in any
RFCs, but is used by Cloudflare's
reverse proxies to signal a network read
timeout behind the proxy to NETA-21 in
front of the proxy.
Solution
Contact customer's network/system
administrator.