In Mozilla 1.1 under XP, I use a wireless laptop on separate LANs at home and at work. When I move from one to another, Mozilla's Web server continues to work but Mozilla's IMAP Mail client fails to check mail and reports a conection refusal on the part of the IMAP server. Restarting Mail alone does not fix the problem but restarting Mozilla completely allows mail to function normally until I change LANs again. This used to work in Netscape 6 and Mozilla 1.0. Thanks, Adrian

I have a laptop which I use at work and home, and use IMAP to read my e-mail. At work, the internal DNS server resolves the name (imap.X.com) to the internal IP address of the machine (192.168.X.X), and on my home LAN the DNS entry (from our public-facing DNS server) is set up correctly with the external IP address of the machine (62.188.X.X). (Adrian, is this similar to your own setup?) If I start Mozilla at work and connect to the mail server, then hibernate the laptop and take it home, and try to read my e-mail from home, Mozilla cannot connect to the server - after a short delay I get 'Connection refused'. Restarting Mozilla (whole app, not just Mail & News) cures the problem. I'm assuming that the IP address of the mail server is not being refreshed when I swap networks. Doing... ipconfig /release ipconfig /renew ipconfig /flushdns ...makes no difference, although other programs seem to notice the change. I haven't tried it with the browser comonent on websites with similar DNS setups (I use Naviscope as a proxy server, and it picks up the change), but will do so when I next get the chance. This is on Mozilla 1.3a (2002121215).

Related, probably same root cause: 188353

can you reproduce this easily? if so, please include the ipconfig output before and after you renew your address. Put the results here and I'll look at them.

Finally I got some spare time to give some more feedback on this. I am using Mozilla 1.4 on Windows XP, but have been living with this bug for ages. It was the same under Win2000 and probably other OSs before that, but I am not sure. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Very easy to reproduce, as described in the other mails, but here it is again: 1) arrive at work. The computer gets its DHCP from the network (below). I get DNS names for my local www server, imap server etc. all with local, private IP numbers. C:\Documents and Settings\alms>ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : cin.ufpe.br IP Address. . . . . . . . . . . . : 172.17.100.22 Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : 172.17.33.254 C:\Documents and Settings\alms>nslookup www.cin.ufpe.br Server: cinns.cin.ufpe.br Address: 172.17.33.111 Name: palmares.cin.ufpe.br Address: 172.17.33.44 Aliases: www.cin.ufpe.br C:\Documents and Settings\alms>nslookup imap.cin.ufpe.br Server: cinns.cin.ufpe.br Address: 172.17.33.111 Name: nazare.cin.ufpe.br Address: 172.17.33.110 Aliases: imap.cin.ufpe.br 2) hibernate (I believe this is not related to hibernation), go home, connect at home (or at any external site), where I (automatically) get another DHCP number and use de same names for accessing my univeristy www site and imap server, *but* the IPs are now different (since my servers now are acessed through NAT): C:\Documents and Settings\alms>ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 192.168.0.164 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.1 C:\Documents and Settings\alms>nslookup www.cin.ufpe.br Server: UnKnown Address: 192.168.0.1 Non-authoritative answer: Name: palmares.cin.ufpe.br Address: 150.161.2.2 Aliases: www.cin.ufpe.br C:\Documents and Settings\alms>nslookup imap.cin.ufpe.br Server: UnKnown Address: 192.168.0.1 Non-authoritative answer: Name: nazare.cin.ufpe.br Address: 150.161.2.100 Aliases: imap.cin.ufpe.br 3) in (2) I have not exited Mozilla, which was started at work. If I try to access my www.cin.ufpe.br site I get an Alert pop-up: The operation timed out when attempting to contact www.cin.ufpe.br If I try to get my e-mail from imap.cin.ufpe.br I get an Alert pop-up: Connetion to server imap.cin.ufpe.br timed out. I suspect I would get the same errrors for pop ou smtp, but haven't tried these. Clearly there is a DNS cache somewhere in Mozilla that, on getting these time out errors, should *try* to get a new DNS name for the host *before* giving up and returning the Alert message. If the DNS resolves to the same IP it should give the error message, but otherwise it should update (or flush) the cache and try again. Obviously whoever implements this has to be careful for not creating a loop (e.g. if this behaviour is used for hosts that map to multiple IP addresses in a DNS lookup it should try contacting the sequence of hosts, but stop after trying them all). Closing Mozilla windows (mail or browser) doesn't help, unless all of them are closed (that is, unless you exit from Mozilla). That is the workaround, I always exit Mozilla completely when I get at home or at work. The bug is not related to changing IP numbers (since if I go to two different places outside my firewall and get different DHCP numbers I do not need to exit Mozilla). Hope you manage to fix this. That forbids me from using the quick startup option (I forgot the name) for Mozilla, since it makes killing and restating Mozilla a bit harder. Changing subjects, I never got the option of using the multiple SMTP servers (to be tried in sequence) working, It always tries only one of them (that is, when the first fails it doesn't try to send the e-mail through the next server). This is probably a different bug, though. Thanks, Andre.

probably fixed by 473483. If you find otherwise, please reopen the bug.