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Service smtp on xxxxxx is not OK : Unexpected service response



I know this has been reported before, but I've gone through all the
offered solutions to no avail.

Problem:
Hobbit 4.1.2p1 runs smtp checks against several Exchange mail servers.
Was working fine until June 6th (when I added RDP service).
Since then, get alternating Green (4 mins) then Yellow (< 1 min) on SMTP
test. 
- Yellow status says "Service smtp on xxxxxxxx is not OK : Unexpected
service response"

- Green status says "Service smtp on xxxxxxxx	 is OK (up)"

- SMTP test always shows as yellow on Hobbit Status pages. 

- Conn test to same IP as SMTP is always Green.

- Telnet to port 25 of SMTP IP from Hobbit command line gives normal
Exchange 220 response.

- Have tried removing RDP service - no change.

- Have tried adding/removing various "send" entries to SMTP test, as per
previous information in the Hobbit archives. I have tried with each of
the following, and with none - 
  send "mail\r\nquit\r\n"
  send "rset\r\nquit\r\n"
  send "ehlo hostname.domainname.com\r\nmailfrom:hobbit (at)
server.com\r\nquit\r\n"
  send "vrfy postmaster\r\nquit\r\n"

- all make no difference. NB: I did restart Hobbit between each change &
waited 10 minutes.

- Without the "send" line, my SMTP entry is as follows:
[smtp]
   expect "220"
   options banner
   port 25

- The RDP test works fine!
[rdp]
   Port 3389

Does anyone have any ideas?

Andrew

Andrew Clarke
Support and Technical Development Officer
BCC IT Solutions
DDI: 0871 288 2036
Tel: +44 (0)1239 710823
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