How to trap an error when connecting to a news server

[gnus via info-gnus-english <info-gnus-english@gnu.org>]

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I have this code:

(defun news-check ()
(message "The result is %d" (gnus-group-get-new-news))
)

(defun news-update ()
(interactive)
(setq quit-for t)
(while (eq quit-for t) ;; this stops if a key is pressed
(setq nnnn 0) ;; This counts seconds and displays them
(while (and (< nnnn 600) (eq t quit-for))
(setq quit-for (sit-for 1)) ;; wait for a second, or a key
(message "count %s" nnnn)
(setq nnnn (+ 1 nnnn))
)
(message "checking...")
(news-check) ;; this calls the above news check
)
)

If the server closes the connection, then this while loop stops. How can
I trap the error and continue the loop so that it tries again in 600
seconds?

I have tried using the condition-case mentioned in the manual but it
seemed to have no effect:

(defun news-check ()
(condition-case err
(message "The result is %s" (gnus-group-get-new-news))
(news-error
(message "I expect the server closed again %s",err)
)
)
)

Sorry if you see this more than once. I posted it to the newsgroup but now I
suspect the newsgroup is read-only.

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