[FW-1] MS Outlook some times hangs on dialup connection

[Datacomm <datacomm_2000@FW1-NOSPAMYAHOO.COM>]

The MS Outlook some times hangs when access exchange
server through securemote on dialup connection but
works properly when accessed on DSLlink or T1 link.
The following is the scenario-

Problem : Checkpoint 4.1 SP2 running on NT. The
Exchange mail server is on the internal network. The
users connect as the exchange client through
Securemote. Outlook hangs often when one opens the
mails with attachment and sometimes it hangs
even if its a small mail.

Observations :

1. Since the problem was with outlook I added the
Exchange server name
in the local lmhosts file. Also changed the rpc
binding order in the
registry. It looked like it fixed the problem for 5
minutes but it was
the same problem again.

2. Even without using the outlook just when running a
ping session to a
system on the local network I observed Request timed
out. After 10 or
20 successful pings it times out and after 2,3 time
outs it replies
back properly. The timeouts increases if I open mails
with attachments.

3. I tried connecting through 3 different ISPs to
check if its a
problem with the ISP.

4.In order to eliminate the switch which is connected
to the external
interface of the firewall we disconnected the switch
and connected a
cross cable directly. But the problem still is
observed.

5. The load on the firewall server as well as the
exchange server is
fine when this hang occurs.

6. The securemote users are configured to use IKE .

7. No error messages are observed in the checkpoint
logs.

Please let me know if you have some suggestions.
Any inputs ?

Thanks and regards

Vikalp Nagori


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