I have recently purchased a RUTX11 4G router and I'm using a Vodafone sim. However, I am unable to use imap to view my emails. I can view my emails when I'm at work and when I use VPN, but when I'm using the RUTX11 router at home, I get the message “Outlook cannot synchronize subscribed folders ...” I get this message regardless of whether I turn the firewall off (on the router) or change the DNS on my computer. I have set up the settings as instructed on my email account website:
For Incoming
Check that the pull-down menu is set to IMAP
Set Server hostname to imap.hermes.cam.ac.uk
For Port select 143
For Connection security select STARTTLS
For Authentication select Normal password
When I am on VPN and IMAP is working, the Outlook log file has the lines:
IMAP: 21:48:37 [rx] * CAPABILITY IMAP4REV1 LITERAL+ ID ENABLE STARTTLS LOGINDISABLED
IMAP: 21:48:37 [rx] x4h3 OK CAPABILITY completed
IMAP: 21:48:37 [tx] nre9 STARTTLS
whereas when I'm not using VPN and IMAP is not working, the Outlook log file has the corresponding lines:
IMAP: 20:55:39 [rx] * CAPABILITY IMAP4REV1 LITERAL+ ID ENABLE LOGINDISABLED
IMAP: 20:55:39 [rx] b60y OK CAPABILITY completed
IMAP: 20:55:39 [db] ERROR: "A secure connection to the server cannot be established.", hr=0x800CCCE1
IMAP: 20:55:39 [db] Connection to 'imap.hermes.cam.ac.uk' closed.
The difference made me wonder whether the problem was to do with STARTTLS. When I use the openssl command on my router I get the following:
root@Teltonika-RUTX11:~# openssl s_client -starttls imap -showcerts -connect imap.hermes.cam.ac.uk:143
CONNECTED(00000003)
didn't found STARTTLS in server response, try anyway...
3069916360:error:140790E5:lib(20):func(121):reason(229):NA:0:
---
no peer certificate available
---
No client certificate CA names sent
...
On the other hand, when I try this command from a network where IMAP works, I get
s********@B*******:~$ openssl s_client -starttls imap -showcerts -connect imap.hermes.cam.ac.uk:143
CONNECTED(00000003)
depth=2 C = BM, O = QuoVadis Limited, CN = QuoVadis Root CA 2 G3
verify return:1
depth=1 C = BM, O = QuoVadis Limited, CN = QuoVadis Global SSL ICA G3
verify return:1
depth=0 C = GB, ST = Cambridgeshire, L = Cambridge, O = University of Cambridge, OU = University Information Services, CN = imap.hermes.cam.ac.uk
verify return:1
---
Certificate chain
0 s:/C=GB/ST=Cambridgeshire/L=Cambridge/O=University of Cambridge/OU=University Information Services/CN=imap.hermes.cam.ac.uk
i:/C=BM/O=QuoVadis Limited/CN=QuoVadis Global SSL ICA G3
-----BEGIN CERTIFICATE-----
MIIHt....
I know very little about STARTTLS, but if you can shed any light on what is wrong with my setup, I'd be very grateful.
