[Xymon] no client results arrive, lot of TIME_WAIT at server

[Norbert Kriegenburg]

experts,

i have a new (not my first) Xymon installation (4.3.28 on RH 7.4, self
compiled).
All looks good, but the clients only show the network tests (conn, ssh).
Only the Xymon server itself shows everything (disk, cpu,...).
- all clients are RH 7.4, same install image used (i just copied over the
client part with client config, create a cronjob for automatic start, so no
root access nor extra install needed)
- nothing suspicious in server or client logs (even in debug mode)
- no ghosts
- if i send a test manually (the old BB way) this shows at Xymon
immediately (so the client settings are ok)
- if i shutdown the xymond at server, the client logs complains:

2017-10-19 05:09:18.051994 Whoops ! Failed to send message (Connection
failed)
2017-10-19 05:09:18.052104 ->  Could not connect to Xymon
daemon at 10.137.56.43:1984 (Connection refused)

(so obviously they communicate)

Querying the xymond shows:
xymon 127.0.0.1 "query clientname.ssh"
green <!-- [flags:OrdastLe] --> Thu Oct 19 05:21:29 2017 ssh ok
is ok, but
xymon 127.0.0.1 "query clientname.disk"
shows nothing

Any ideas?

Norbert
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