You might try upgrading Exchange 5.5 to SP4. Not sure how long ago sp2 came out, but it's been a few years at least. Could be something there. Jared Teche Network Administrator SITEL Corporation jteche@xxxxxxxxxxxxx 608-827-3862 -----Original Message----- From: Neil Luczynski [mailto:n.a.l@xxxxxxxxxxxxxxxx] Sent: Wednesday, May 15, 2002 7:59 AM To: [ExchangeList] Subject: [exchangelist] Exchange 5.5 and NT4 Sp6a http://www.MSExchange.org/ Anyone out there had problems upgrading an NT4 box at Sp4 running Exch 5.5 Sp2 to NT4Sp6a. We recently done this on our servers and all the NT4Sp6a boxes could not make external RPC connections. Exchange boxes still on NT4Sp4 could connect OK to the Sp6a boxes, but not vice versa. Any help or ideas gratefully recieved. ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: jteche@xxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')