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Re: printer problem
From: Bill_Royds () pch gc ca
Date: Tue, 8 May 2001 14:08:00 -0400

Port 515 has been the object of many Internet attacks recently (LPrng exploit)
so many ISPs may have blocked it.. Do a simple traceroute from your site to
printer and verify with ISPs on the way that they are not blocking it.
By the way, allowing printing over the Internet is a good way to get hacked so
you really should find a better way to send your printing remotely.

hermit1 <hermits () mac com> on 05/08/2001 12:20:17
 To:      firewall-wizards () nfr net                            
 cc:      (bcc: Bill Royds/HullOttawa/PCH/CA)                 
 Subject: [fw-wiz] printer problem                            

I have a very odd problem.  There are people here using a remote printer,
and last week they lost access to the printer.  Of course they blamed the
firewall, but FW-1 logs show the connections going out just fine.  Doing a
telnet to the remote IP on port 515 times out.  Traceroute, ping, telnet -
all reach the destination.  We tried from home (two different ISPs) and
could not connect on port 515.

Sounds like port 151 was blocked at their end, but users from other sites
can reach that printer without trouble.  Their network person can reach the
printer from his home ISP, and print.

My guess is that someone somewhere put a block on port 515.  Is there any
way to find such a block?  Doing traceroute on port 515 would be good.....


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