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Mac can no longer connect to SMB share

nstd-sts
nstd-sts asked
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We have a data share that's on a server that's part of domain A.  We have users in domain B with user accounts in domain A that need to access this share.  On pc's this works fine and up until last week it worked on the macs as well.  Now on the macs (in either domain) we get an authentication failure when we try to mount it using the "GO, TO SERVER" from the mac toolbar.  Unfortunately my mac guy is out of town and I don't see any indication on the Active Directory side what's going wrong.  On the macs I've tried to tail some of the logs in /var/log but I get "access denied" on all of them.  Is there any logging on the macs I can check to see what's failing?  
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I'm not a Mac person, but when I've been in a similar boat, the culprit has usually been either SMB signing, or the Mac users' accounts in AD have had their passwords expire.  Last time I dealt with it, a Mac couldn't deal with the AD password expiry, and just fired off an "access denied"-  the Mac users either had to be set with a non-expiring password, or they had to log onto a Windows box to change their password.
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Commented:
Are you able to ping the server from the Macs?  Does a name lookup resolve the server IP correctly?

Have you made any policy changes on the file server or through AD?

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Commented:
I've tried it from domain A with my admin account which I know isn't expired and it fails.  Connection doesn't seem to be an issue, it pings and resolves without any problems.

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Commented:
lamaslany,

no, no policy changes.  the file server is actually a emc datamover
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As LauraEHunterMVP said this might be symptomatic of SMB signing - has anyone made any policy changes on your file server/AD
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Commented:
Sorry - what can I say; i'm just that kind of impatient!  ;)
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Which model is the ECM device?

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Commented:
NS704G running Dart 5.5
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Do you happen to know which protocol the Macs are using to connect?

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Commented:
it's a cifs share so I'd assume the mac is using smb.  I've been trying to connect using smb://servername

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Commented:
Didn't really get fixed, the executives closed the support budget and told the mac users to either use a pc or pound sand.  

thanks for your help

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