Problems with IMAP connection to gmail

Posted on 2011-03-16
Last Modified: 2012-05-11
Hi All

Our ISP is being a right pain with this problem but 1 months ago those of use that used imap via outlook lost connection to this and for the time being have had to switch to the web version via firefox or IE.
I also use imap with my apple email address but this has coped as it can connect via the unsecure ports 143 and 25

As gmail doesnt seem to have unsecure ports it very frustrating and the ISP claims there are no problems they can find. Can anyone help me in confirming there are problems connecting via gmails 993 SSL and 587 ports as im not quite sure how best to do this.

Question by:David
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Expert Comment

ID: 35148196
What you may want to try to confirm from your network:

Attempt to telnet to "" on port 993.  I tested it from my machine and when I attempt to connect to the standard 143 port, nothing happens.  If I do it to 993, you see a connection open but no output.

It would give you indication that there isn't a port blocked somewhere.  If it does work, you may want to run through the setup directions for gmail, and make sure it is enabled in your accout settings.

Author Comment

ID: 35148413
Yeah i tired telnet earlier but no luck on the 993 port either to gmail or my other account, on the account they allow non secure connections on port 143 which worked, but i dont know how to test if its a block on the computers on this domain or if its a block from the isp, and the isp arent being much help.

Expert Comment

ID: 35148795
I'd look over your router that everyone is connected to.  I don't know what ISP you use, but most I don't believe would be blocking those ports.  It's common for them to block 25 to stop spam.

You may also have antivirus/firewall software that could be restricting the connection.

If you have a cisco router, you may want to try the same telnet test from it's console.
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Author Comment

ID: 35148961
being a secondary school we have a lot of blocks, but i will question them again, its a shame they dont allow us much control over the equiptment

Expert Comment

ID: 35149047
I know the hurdles and pains.

Just so you can see, if I telnet to 587, I get the following output:

220 ESMTP c17sm1391104anc.35

Port 993 flashes to a blank screen but no output.  I can' think of a good way to test if it is on your end or theirs without disabling firewalls and checking your hardware/setup.

Accepted Solution

David earned 0 total points
ID: 35189413
After all the telnet testing, they finally admitted that their firewall was randomly blocking connections, and its now sorted, thanks again

Author Closing Comment

ID: 35225285
ISP firewall problem

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