iOS users tripping DoS filter this week

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rtkluttz
Posts: 27
Joined: Mon May 06, 2019 12:00 pm

iOS users tripping DoS filter this week

Post by rtkluttz »

All of a sudden this week, a rather large contingent of iOS users are tripping the DoS filter in our Zimbra. We have done a factory reset on a couple iphones and the problem seemed to resolve but some of the other ones did not. We have a couple of work from home households where there are more than 1 iOS device and their home IP keeps getting added to the DoS filter.

The zimbra logs show that the devices keep trying to sign in in some way but are presenting an empty password to Zimbra (see log below). The rate of the failed login attempts also seems to vary.

Code: Select all

2021-09-28 08:14:34,156 INFO  [qtp2076287037-995728:https://webmail.affecteddomain.com/service/soap] [name=affecteduser@affecteddomain.com;oip=<users home IP address>;port=44328;soapId=cb411e6;] SoapEngine - handler exception: authentication failed for [affecteduser@affecteddomain.com], empty password
2021-09-28 08:14:44,219 INFO  [qtp2076287037-995722:https://webmail.affecteddomain.com/service/soap] [name=affecteduser@affecteddomain.com;oip=<users home IP address>;port=44596;soapId=cb41220;] SoapEngine - handler exception: authentication failed for [affecteduser@affecteddomain.com], empty password
2021-09-28 08:14:54,356 INFO  [qtp2076287037-995835:https://webmail.affecteddomain.com/service/soap] [name=affecteduser@affecteddomain.com;oip=<users home IP address>;port=44822;soapId=cb4124f;] SoapEngine - handler exception: authentication failed for [affecteduser@affecteddomain.com], empty password
2021-09-28 08:15:04,415 INFO  [qtp2076287037-995826:https://webmail.affecteddomain.com/service/soap] [name=affecteduser@affecteddomain.com;oip=<users home IP address>;port=45094;soapId=cb41287;] SoapEngine - handler exception: authentication failed for [affecteduser@affecteddomain.com], empty password
2021-09-28 08:15:14,481 INFO  [qtp2076287037-995824:https://webmail.affecteddomain.com/service/soap] [name=affecteduser@affecteddomain.com;oip=<users home IP address>;port=45366;soapId=cb412bc;] SoapEngine - handler exception: authentication failed for [affecteduser@affecteddomain.com], empty password
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